to use / to employ / to make use of, to apply / to spend

practice (learning or improvement of a skill)

practice

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

(music) a song / (poetry) poetry

a song; to sing / Japanese poetry; waka

song; sing

to use one's head