slacks

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. 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

Semi-formal trousers that are less formal than those part of a suit but suitable for wearing in most offices and therefore nowadays no longer considered casual trousers. (Takes a plural verb even when referring to a single pair; may be referred to as a pair of slacks)