expression, godan verb (iku/yuku class)
go fishing
A common phrase meaning to go somewhere for the purpose of fishing. The verb 行く conjugates as a godan verb (special iku/yuku class).
週末はよく釣りに行く。
I often go fishing on weekends.
明日、友達と釣りに行く予定だ。
I plan to go fishing with a friend tomorrow.
釣る is the verb 'to fish' (catch fish), while 釣りに行く is the phrase 'go fishing' (travel to a place to fish).
Compound of 釣り (fishing, noun form of 釣る) + に (particle indicating purpose) + 行く (to go).