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Idioms and Phrases with best part of something

best part of something

Nearly all of something, the majority, as in The dentist was late; I waited for the best part of an hour. The adjective best here does not concern quality but quantity. [First half of 1500s] Also see better half, def. 1.

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.