plural of Slack

Third-person singular simple present indicative form of slack

(dated) 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.)

plural of slack

simple past tense and past participle of slack

present participle of slack

(countable) A valley, or small, shallow dell.

(mining) Small coal; coal dust.

(rail transport) A temporary speed restriction where track maintenance or engineering work is being carried out at a particular place.

To slacken. / (obsolete) To mitigate; to reduce the strength of. / To lose cohesion or solidity by a chemical combination with water; to slake.