1. whether you like it or not; certain to happen; there is no other choice

1. If you miss one word, you're out of the spelling bee. Like it or lump it.

2. John: I don’t like this room. It’s too small. Bill: Like it or lump it. That’s all we’ve got.

3. Jane: I don’t want to be talked to like that. Sue: Well, like it or lump it! That’s the way we talk around here.