expression, godan verb (-tsu)
cast a net; throw a net
Refers to the physical action of throwing or casting a fishing net.
漁師が川で網を打つ。
The fisherman casts a net in the river.
Compound of 網 (ami, 'net') + を (o, object marker) + 打つ (utsu, 'to hit, strike, throw'). The verb 打つ here carries the sense of 'to cast' or 'to throw'.