rack one's brains

cerebrospinal fluid / (by extension) brains

untie; unravel; undo (a fastening); unwrap / dispel (doubts); clear up (a matter)

solve (a problem); answer (a question); unravel (a riddle) / comb; untangle (hair)

strangle; constrict / to wring; to squeeze; to milk

to wring, press, squeeze / to reduce/lower loudness of a sound

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

examination, exam, test / quiz