one's usual practice, one's old trick; one's usual modus operandi, the same old tactic

to use one's head

use one thing for many purposes / work someone hard

mechanism, contraption / trick / Short for 絡繰り人形 (karakuri ningyō).

(colloquial) current boyfriend

everything

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

everyone, one and all

representing relationship to a family

house of something, place where some business is conducted / person who does that thing