use one thing for many purposes / work someone hard

to use one's head

慣用音: a reading of a kanji that is commonly accepted, but originally based on a corrupted reading

a normalized kanji reading that falls outside of the conventional categories (呉音 (gōon), 漢音 (kan'on), 唐音 (tō'on)), not showing the expected correspondences to the "correct" Chinese pronunciation recorded in rime dictionaries

everyday use, common usage, idiomatic usage

fixed expression; idiom

houseplant; ornamental plant

everything

(colloquial) current boyfriend

(slang) Alternative form of 彼氏 (kareshi, “boyfriend”)