mái​tóu

countersunk

埋头 (埋頭) mái​tóu
countersunk verb
referring to a screw or rivet head that is flush with or below the surface

This furniture assembly requires the use of countersunk screws.

immerse oneself verb
to be fully engrossed in or concentrate intensely on a task

He has been immersing himself in preparing for the postgraduate entrance exam lately.

lower head verb
to bend or drop the head downward, often to hide or avoid something

He trudged through the wind and rain with his head down.

Frequency

Movie subtitles
1.07 per million appears in 1% of films
Written text
3.37 per million

Sources

Definitions
CC-CEDICT