to use something skilfully, to use something to its full potential

Short for 重機関銃 (jūkikanjū, “heavy machine gun”). / heavy machinery; heavy equipment

triumphant, proud / skilled

strong point / triumph / regular customer

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

regular costumer; patron

everything

(colloquial) current boyfriend