Slack

1. The part of anything that hangs loose, having no strain upon it.

   take in the slack

2. A tidal marsh or shallow that periodically fills and drains.

1. (normally said of a rope) Lax; not tense; not firmly extended.

   a slack rope

2. Weak; not holding fast.

   a slack hand

3. Lacking diligence or care; not earnest or eager.

   slack in duty or service

4. Not active,successful, or violent.

   Business is slack.

5. Excess; surplus to requirements.

   the slack capacity of an oil pipeline

6. Vulgar; sexually explicit, especially in dancehall music.

1. Slackly.

   slack dried hops

1. To slacken.
2. To mitigate; to reduce the strength of.
3. To lose cohesion or solidity by a chemical combination with water; to slake.

   Lime slacks.

noun

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

noun

A valley, or small, shallow dell.

noun

Small coal; coal dust.