slacks

American

[slaks] / slæks /

noun

(used with a plural verb)

men's or women's trousers for informal wear.

slacks British

/ slæks /

plural noun

informal trousers worn by both sexes

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of slacks

First recorded in 1815–25; slack ¹ + -s ³

Compare meaning

How does slacks compare to similar and commonly confused words? Explore the most common comparisons:

trousers vs. slacks

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The dads were in their after-work best: slacks and a sweater, some sort of brown shoe.

From The Wall Street Journal • Jan. 14, 2026

Wearing polka-dot slacks, she went to the hotel where Ford was speaking to the World Affairs Council.

From Los Angeles Times • Sep. 25, 2025

They were medium-handsome, in their 70s, and dressed dapperly in khaki slacks and navy sport coats bearing name tags that identified them as Bill and Frank.

From Salon • Jul. 4, 2025

Two men were outside Jackson’s door, Jackson said, dressed in slacks and polos.

From Slate • Apr. 23, 2025

Boys and girls in dark and light hues, dressed in skirts and slacks, looking like they’ve just come out of school.

From "X: A Novel" by Ilyasah Shabazz

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023