(mining) Small coal; coal dust.

The state of being slack; the quality of having slack. / Vulgarity in West Indian culture. / A subgenre of dancehall music with sexual lyrics.

present participle of slack

simple past tense and past participle of slack

plural of slackness

A surname.

Full of laxity; characterised by laxness; relaxed; (by extension) unmotivated, lazy.

A large container full of water or oil or brine used by a blacksmith to quench hot metal.

With the mouth in an open position and the jaw hanging loosely, especially as indicating bewilderment or astonishment. / (by extension) Unsophisticated or unthinking; dimwitted in appearance.

(UK) A cheap fuel consisting of slack (coal dust) and small lumps of coal (nuts); unlike other solid fuel it was not rationed during the period after World War II.