undersets

/ˈʌndərˌsɛts/
noun
  1. A current of water that flows beneath the surface, often in a different direction from the surface current.
    • Fishermen know to watch for undersets that can drag their nets deeper.
    • The swimmer was caught in an underset and pulled away from the shore.
    • The underset near the reef made the water look calm on top but dangerous below.
  2. A hidden or underlying tendency, influence, or force that affects a situation.
    • There was an underset of tension in the room despite the friendly conversation.
    • Her calm voice had an underset of anger that everyone noticed.
    • The economic report revealed an underset of optimism among small business owners.