Dictionary

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

Example: take in the slack

A tidal marsh or shallow that periodically fills and drains.

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

Example: a slack rope

Weak; not holding fast.

Example: a slack hand

Lacking diligence or care; not earnest or eager.

Example: slack in duty or service

Not active,successful, or violent.

Example: Business is slack.

Slackly.

Example: slack dried hops

To slacken.

To mitigate; to reduce the strength of.

To lose cohesion or solidity by a chemical combination with water; to slake.

Example: Lime slacks.

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

A valley, or small, shallow dell.

Small coal; coal dust.