IPA: /ˈʌndərˌsɛt/
KK: /ʌndərˈsɛt/
A current of water that flows beneath the surface of the ocean, often moving in a different direction than the surface currents.
The diver was cautious of the strong underset that could pull him away from the boat.
Underset → It is formed from "under-" (meaning beneath) and "set" (from Old English "settan", meaning to place or put). The word "underset" means to place something beneath or to support from below.
Think of placing something 'beneath' ('under-') to provide support or stability — that's what 'underset' means.