noun, plural mouthfuls.
the amount a mouth can hold.
the amount taken into the mouth at one time.
a small quantity.
Informal. a spoken remark of great truth, relevance, effectiveness, etc.: You said a mouthful!
a long word or group of words, especially one that is hard to pronounce.

1375–1425; late Middle English. See mouth, -ful

See -ful. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mouthful (ˈmaʊθˌfʊl)
n , pl -fuls
1.  as much as is held in the mouth at one time
2.  a small quantity, as of food
3.  a long word or phrase that is difficult to say
4.  informal (Brit) an abusive response
5.  informal chiefly (US), (Canadian) an impressive remark (esp in the phrase say a mouthful)

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

"a lot to say," 1748, from mouth + -ful.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Idioms & Phrases


see say a mouthful.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
As its mouthful of a hyphenated name suggests, though, this town wasn't always
  so tight-knit.
It's a mouthful, figuratively, and yet still that is remarkably simplified from
  the actual processes that take place.
The frog enjoyed what he ate, but almost every mouthful she took choked her.
Or perhaps you're still recovering from a traumatic encounter with a mouthful
  of gristle.
Idioms & Phrases
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