a device used to scare away birds and animals / a traditional device found in Japanese gardens, composed of a bamboo tube that when filled with water revolves to empty and makes a clanking sound

Hesiod

bluff, empty threat, paper tiger

use one thing for many purposes / work someone hard

to use one's head

(broadcasting)

everything

(colloquial) current boyfriend

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

everyone, one and all