Idiom: to toss something
Context #1:
Sean: Hey Tim! Smell this milk and tell me if you think it is still good.
Tim: (After smelling the milk) Whoa! That milk stinks! I would toss it if I were you.
Sean: Yeah, I guess you're right. I'll get some fresh milk today.
Context #2:
Kathy: Can I borrow your backpack this weekend? We're going hiking on Saturday.
Tiffany: Actually, that backpack had a huge rip on the bottom and instead of trying to fix it I just tossed it. Sorry about that!
Kathy: That's alright. I think Andrew has an extra one. I'll ask him.
Meaning: "to toss something" means to throw something away. Usually people toss something because it's old, broken, or no longer needed.
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