When you lightly throw something, you toss it. You might toss your lifejacket and backpack into a canoe before climbing in with the paddles.
You can toss a baseball to your friend in the backyard, or toss your trash in a wastebasket when you're finished with lunch. You can also toss a coin or toss a salad. Another way to toss is to move back and forth — or thrash — like an insomniac in bed or a boat on a stormy ocean.