Refers to the sport or activity of surfing, or the waves themselves. Often used in compounds like サーフィン (surfing) or サーフボード (surfboard).
I always enjoy surfing on weekends.
今日はサーフが高くて危険だ。
The surf is high and dangerous today.
surf casting
surf jet
surf rider; surfer
surf roller
surf trolling
surf music
surf casting
Borrowed from English 'surf'.