noun

undertow

undertow, undercurrent, rip current

The strong undertow pulled the swimmer out to sea.

The strong undertow pulled the swimmer out to sea.

There was an undertow of sadness in her voice.

There was an undertow of sadness in her voice.

((a/the)) undertow a current of water below the surface Be careful of the strong undertow.

((an)) undertow ((of sth.)) a hidden feeling or quality There was an undertow of tension in the room.

Synonyms: rip current, undercurrent

From 'under' + 'tow' (to pull). It signifies a current that pulls beneath the surface.

Imagine being 'towed' 'under' the surface of the water.

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