To cut with a sweeping or slashing motion, often with a sharp instrument. He slashed the canvas with a knife, creating a jagged tear.
To reduce or decrease something drastically. The company decided to slash prices to attract more customers.
To criticize someone or something harshly. The critics slashed the movie for its lack of originality.
To urinate. (slang, chiefly British) Hang on—I've got to slash before we get back on the road.