slacks

Short definition from Wiktionary

Noun

1. 1
   plural of slack
2. 2
   Semi-formal trousers which are less formal than those that are part of a suit but nowadays are considered suitable casualwear in most offices. (Takes a plural verb even when referring to a single pair; may be referred to as a pair of slacks.)

Verb

1. 1
   third-person singular simple present indicative of slack

Proper noun

1. 1
   plural of Slack