across

[uh-kraws, uh-kros]
preposition
1.
from one side to the other of: a bridge across a river.
2.
on or to the other side of; beyond: across the sea.
3.
into contact with; into the presence of, usually by accident: to come across an old friend; to run across a first edition of Byron.
4.
crosswise of or transversely to the length of something; athwart: coats across the bed; straddled across the boundary line.
adverb
5.
from one side to another.
6.
on the other side: We'll soon be across.
7.
crosswise; transversely: with arms across.
8.
so as to be understood or learned: He couldn't get the idea across to the class.
9.
into a desired or successful state: to put a business deal across.
adjective
10.
being in a crossed or transverse position; crosswise: an across pattern of supporting beams.

Origin:
1470–80; a-1 + cross

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
across (əˈkrɒs)
 
prep
1.  from one side to the other side of
2.  on or at the other side of
3.  so as to transcend boundaries or barriers: people united across borders by religion and history; the study of linguistics across cultures
4.  fully informed about; dealing with: we are across this problem
 
adv
5.  from one side to the other
6.  on or to the other side
 
[C13: on croice, acros, from Old French a croix crosswise]

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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Etymonline
Word Origin & History

across
c.1300, from Anglo-Fr. an cros "in a crossed position," lit. "on cross." Prepositional meaning "from one side to another" is first recorded 1590s; meaning "on the other side (as a result of crossing)" is from 1750. Phrase across the board originally from horse-racing, in reference to a bet of the same
amount of money on a horse to win, place, or show.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Idioms & Phrases

across

In addition to the idiom beginning with across, also see come across; cut across; get across; put across; run across.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
The fossa is filled with fatty tissue across which numerous fibrous bands extend from side to side.
To the contrary, it changes across time and space, in response to the movements it opposes.
Public universities across the country are engaged in an all-out war for
  out-of-state students.
Surely huge herds of animals walking across vast, open plains.
Slang
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