(idiomatic) "a fish who's found water" → In one's element, a duck to water.

a swimsuit, a bathing suit, swim trunks

(Kagoshima dialect) a letter, epistle (written message or note)

islander or islanders

a prefecture in the 近畿 (Kinki) region of Japan facing the Pacific Ocean; its capital city is 津 (Tsu)

meaningless

nonsense / meaninglessness

熊の実, 熊之実, 隈之魚, 隈魚: a Clark's anemonefish

civil law

decorative Japanese cord made from twisted paper