1. (n.) A current below the surface of water, sometimes flowing in a contrary direction to that on the surface.

2. (n.) Hence, figuratively, a tendency of feeling, opinion, or the like, in a direction contrary to what is publicly shown; an unseen influence or tendency; as, a strong undercurrent of sentiment in favor of a prisoner.

3. (a.) Running beneath the surface; hidden.

affect affection affluence afflux affluxion air current allegory allusion ambiance ambience arcane meaning assumption atmosphere aura bucking challenge coloration concourse confluence conflux connotation contention contradiction contraposition contravention contraversion coral heads counteraction counterbalance counterblast countercurrent counterforce counterinfluence counterpoise counterpressure counterweight counterworking course crosscurrent crossing current current of air defluxion denial downdraft downflow downpour draft drift driftage emotion emotional charge emotional shade experience fall wind feeling feeling tone flavor flow flow of air flowing fluency flux following wind foreboding foul wind gush gut reaction head wind heartthrob hint implication implied meaning import impression impugnation impugnment indraft inference inflow inhalation innuendo inrush inspiration intimation ironbound coast ironic suggestion jetstream katabatic wind ledges lee shore meaning metaphorical sense mill run millrace monsoon movement of air murmur negation nuance occult meaning onrush onward course opposing opposition opposure oppugnation outflow overtone passion pitfall presentiment presumption presupposition profound sense quicksands race reaction rebutment rebuttal refusal rejection resistance response rockbound coast rocks run rush sandbank sandbar sands sensation sense sentiment set shallows shoals spate standing against stream stream of air subsense subsidiary sense suggestion supposition surge symbolism tail wind tendency tenor tide tinge touch traversal trend undermeaning undertone undertow updraft vibes vibrations water flow wind