Dictionary of American Idioms (Barron's Idioms)

Scholastic Dictionary of Idioms

The American Heritage Dictionary of Idioms, Second Edition

Ultimate Phrasal Verb Book (Barron's Foreign Language Guides)

Why Do We Say It?: The Stories Behind the Words, Expressions, and Cliches We Use

NTC's Dictionary of Everyday American English Expressions (McGraw-Hill ESL References)

McGraw-Hill's Dictionary of American Slang and Colloquial Expressions: The Most Up-to-Date Reference for the Nonstandard Usage, Popular Jargon, and Vulgarisms of Contempos (McGraw-Hill ESL References)

Scholastic Dictionary of Idioms: More Than 600 Phrases, Sayings & Expressions

In a Pickle: And Other Funny Idioms

The Farlex Idioms and Slang Dictionary

Oxford Dictionary of English Idioms (Oxford Quick Reference)