v.1. To return something with a toss: The children on the other side of the fence asked me to toss back the baseball. The catcher tossed the ball back to the pitcher.
2. To fling something, such as a body part, backward: She tossed back her head and laughed. The child tossed his arms back and ran down the hill.
3. To return some fish to the water after catching it: As sport fishermen, we toss back most of the fish we catch. The fish was too small, so I had to toss it back.
4. Slang To drink something quickly, especially in one draft by suddenly tilting: The bartender tossed back a shot of whiskey. I tossed my coffee back and left the restaurant.