1. to save; to rescue; to spare
待ってろ、今助けてやるから。Hang on, I'm coming to save you.
2. to help; to assist
いや、助けなくてもいいんだ。No, you don't have to help.
3. to support (financially); to contribute (to); to provide aid
4. to facilitate; to stimulate; to promote; to contribute to