head down, bum up

UK not-comparable slang

(UK, slang) Hard at work; preparing oneself to work hard.

Japanese Meaning

一生懸命働く（ひたすら、全力で働く） / 仕事に取り組むための準備や心構えを整える

She stayed head down, bum up until the prototype was ready.

彼女は試作品が完成するまで必死に働き続けた。

Sense（1）

(UK, slang) Hard at work; preparing oneself to work hard.

Hadn't heard a thing. Hard at work, head down, bum up.

head down

（ canonical ）

bum up

（ canonical ）