underswell

English

Etymology

From under- +‎ swell.

Pronunciation

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Noun

underswell (plural underswells)

1. An undercurrent.
2. A swelling undersection.
   • 1963, J. G. Ballard, Passport to Eternity:

     Something had altered the normal perspectives of the room. Trying to focus on the grey underswell of the ceiling, I listened for footsteps outside. Sure enough, the corridor wall began to retract.