if push comes to shove
Meaning: You can say "if push comes to shove" before saying what you'll do if things don't go as well as you'd like, and you're forced to do something that you'd rather not do.
- I've made up my mind and I'm going to have a career in music. I'd love to be in a successful band, but if push comes to shove I can earn money by teaching guitar.
- Sandy says she really wants to stay in her apartment, but if push comes to shove she'll just have to move out and find somewhere cheaper.