noun
Refers to a current flowing beneath the surface of water, or metaphorically to a hidden trend or feeling.
この川には強い暗流があるので、泳ぐのは危険だ。
There is a strong undercurrent in this river, so swimming is dangerous.
会議では、反対派の暗流が感じられた。
At the meeting, an undercurrent of opposition could be felt.