throw oneself away on someone—ruin one’s life on behalf of another person (usually a male who doesn’t deserve it):
- I could forgive her if she hadn’t thrown herself away on such a cheap sort of fellow.
throw oneself on someone —(also: throw oneself at someone)
1. physically attack a person:
- Mulder couldn’t bear the humiliation and he kicked out at Fido, throwing himself on the man.
2. (of a woman) make very obvious her desire to begin a romantic relationship with a man:
- It wasn’t the first time any of us saw her throw herself on men she didn’t know.