adjective, smoother, smoothest.
free from projections or unevenness of surface; not rough: smooth wood; a smooth road.
generally flat or unruffled, as a calm sea.
free from hairs or a hairy growth: a smooth cheek.
of uniform consistency; free from lumps, as a batter, sauce, etc.
free from or proceeding without abrupt curves, bends, etc.: a smooth ride.
allowing or having an even, uninterrupted movement or flow: smooth driving.
easy and uniform, as motion or the working of a machine.
having projections worn away: a smooth tire casing.
free from hindrances or difficulties: a smooth day at the office.
noting a metal file having the minimum commercial grade of coarseness for a single-cut file. Compare dead-smooth.
undisturbed, tranquil, or equable, as the feelings, temper, etc.; serene: a smooth disposition.
elegant, easy, or polished: smooth manners.
ingratiatingly polite or suave: That salesman is a smooth talker.
free from harshness, sharpness, or bite; bland or mellow, as cheese or wine.
not harsh to the ear, as sound: the smooth music of a ballroom dance band.
Phonetics. without aspiration.
in a smooth manner; smoothly.
verb (used with object)
to make smooth of surface, as by scraping, planing, or pressing.
to remove (projections, ridges, wrinkles, etc.) in making something smooth (often followed by away or out ).
to free from difficulties.
to remove (obstacles) from a path (often followed by away ).
to make more polished, elegant, or agreeable, as wording or manners.
to tranquilize, calm, or soothe (a person, the feelings, etc.).
Mathematics. to simplify (an expression) by substituting approximate or certain known values for the variables.
act of smoothing: She adjusted the folds with a smooth of her hand.
something that is smooth; a smooth part or place: through the rough and the smooth.
Verb phrases
smooth over, to make seem less severe, disagreeable, or irreconcilable; allay; mitigate: He smoothed over my disappointment with kind words.

before 1050; (adj.) Middle English smothe, late Old English smōth; compare Middle English smethe, Old English smēthe smooth; cognate with Old Saxon smōthi; (v.) late Middle English smothen, derivative of the adj.; replacing Middle English smethen, Old English smēth(i)an

smoothable, adjective
smoother, noun
smoothly, adverb
smoothness, noun
oversmooth, adjective
oversmoothly, adverb
oversmoothness, noun
presmooth, verb (used with object)
resmooth, verb (used with object)
unsmooth, adjective
unsmoothly, adverb
unsmoothness, noun
unsmoothed, adjective

1. glossy, polished, even, flat. See level. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
smooth (smuːð)
1.  resting in the same plane; without bends or irregularities
2.  silky to the touch: smooth velvet
3.  lacking roughness of surface; flat
4.  tranquil or unruffled: smooth temper
5.  lacking obstructions or difficulties
6.  a.  suave or persuasive, esp as suggestive of insincerity
 b.  (in combination): smooth-tongued
7.  (of the skin) free from hair
8.  of uniform consistency: smooth batter
9.  not erratic; free from jolts: smooth driving
10.  not harsh or astringent: a smooth wine
11.  having all projections worn away: smooth tyres
12.  maths (of a curve) differentiable at every point
13.  phonetics without preliminary or simultaneous aspiration
14.  gentle to the ear; flowing
15.  physics (of a plane, surface, etc) regarded as being frictionless
16.  in a calm or even manner; smoothly
vb (often foll by down) (often foll by out or away)
17.  to make or become flattened or without roughness or obstructions
18.  to take or rub (away) in order to make smooth: she smoothed out the creases in her dress
19.  to make calm; soothe
20.  to make easier: smooth his path
21.  electrical engineering to remove alternating current ripple from the output of a direct current power supply
22.  obsolete to make more polished or refined
23.  the smooth part of something
24.  the act of smoothing
25.  tennis, squash, badminton Compare rough the side of a racket on which the binding strings form a continuous line
[Old English smōth; related to Old Saxon māthmundi gentle-minded, smōthi smooth]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. smoð "free from roughness, not harsh," of unknown origin. Sense of "pleasant, polite, sincere" first recorded c.1390. Slang meaning "superior, classy, clever" is attested from 1893. The verb is first recorded c.1440. Smooth-bore in ref. to guns is from 1812. smooth talk (v.) is recorded from
1950. A 1599 dictionary has smoothboots "a flatterer, a faire spoken man, a cunning tongued fellow." The usual O.E. form was smeðe, and there is a dial. smeeth found in places names, e.g. Smithfield, Smedley.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Idioms & Phrases


In addition to the idioms beginning with smooth, also see take the rough with the smooth.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
The outer walls of the dwellings were plastered with a smooth coat of mud, and
  the upper facades painted creamy white.
After a long struggle, the bottom of the stream was perfectly smooth.
The air inside is pleasantly cool, and the walls are smooth and dry, with
  patches of original plaster.
Uncle found a skull face carved on brownish rock, hand size, and the back of
  the rock is smooth.
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