[埋头苦干 / 埋頭苦幹, mái tóu kǔ gànㄇㄞˊ ㄊㄡˊ ㄎㄨˇ ㄍㄢˋ] to bury oneself in work (成语 saw); to be engrossed in work; to make an all-out effort; up to the neck in work#31484
[うめる, umeru] (v1, vt) (1) to bury (e.g. in the ground); (2) to fill up (e.g. audience fills a hall); to fill (a seat, a vacant position); (3) to plug gaps; to stop a gap; (4) to make amends; to cover up for something; (5) to put cold water in a bath; (6) to cover; to scatter something over; (P)#18509
[うずめる, uzumeru] (v1, vt) (1) to cover; to bury (e.g. one's face in hands); to submerge; (2) to fill (completely); to stuff; to pack; to cram; to fill up; (P)#18509