noun
swinging a knife around; brandishing a knife
Rare term for the act of waving or brandishing a knife, often in a threatening or reckless manner.
酔っ払いが刃物三昧に及んだため、警察が呼ばれた。
The police were called because a drunk person started brandishing a knife.
Compound of 刃物 (hamono, 'bladed tool') and 三昧 (zanmai, 'absorption, indulgence'). The exact derivation is uncertain; it likely refers to being absorbed in the act of wielding a knife.