buckle (belt clasp)

to fasten / to kill (fish)

tight / reliable

be fast, securely in place / be reliable, level-headed / keep going, keep trying

stable, fulfilled

fast (in a firm or secure manner), tightly / surely, unwaveringly, steadily, reliably

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

(colloquial) current boyfriend