(idiomatic) to hold the key (to)

to insert

insertion

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

hole, opening

hole / opening, aperture / pit / cave, cavern / lair, den, burrow / loss, deficit / flaw, defect

(dated) gaggingly, heavingly / (dated) belchingly, burpingly

(dated) a burp, a belch