slack

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

A dip in a surface.

In particular, a shallow dell or hollow; a dip in the surface of terrain, such as between hills.

A low-lying marsh or a pool, especially a tidal or intermittent one which periodically fills and drains.

Attributive form of slacks (“semi-formal trousers”).

Unconditional listening attention given by client to patient.

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

A valley, or small, shallow dell; a sag or saddle in a ridge.

A flat-bottomed, hollow zone within a sand-dune system that has developed over impervious strata, sometimes due to erosion or blow-out of the dune system; its flat base level is therefore close to or at the permanent water-table level, and therefore has rich, marshy flora, with Salix species (willows) as typical woody colonisers.

Small coal; coal dust.

To slacken.

To mitigate; to reduce the strength of.

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

To refuse to work as hard as one is supposed to.

Lax; not tense; not firmly extended.

Moderate in some capacity.

Moderately warm.

Moderate in some capacity.

Moderate in speed.

Lacking diligence or care; not earnest or eager.

Not active or busy, successful, or violent.

Excess; surplus to requirements.

Vulgar; sexually explicit, especially in dancehall music.

Lax.

Weak; not holding fast.

Slackly.