Other
- Charlie Slack, American basketball player
- Slack (project management), a term used in project management
- The central belief of the Church of the SubGenius
- Small pieces of low-grade bituminous coal.
- Slackness, lyrics of a crude or bawdy nature in dancehall music are often called "slack".
- Slacks, a synonym for trousers
- File slack, a kind of internal fragmentation
- The valley or trough between dunes.
- Slack variable, a mathematical concept.
- Slack action between railway car couplings
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