[push off] or [shove off] {v.}
1. To push a boat away from the shore.
* /Before Tom could reach the boat, Jake had shoved off./
2. {slang} To start; leave.
* /We were ready to push off at ten o'clock, but had to wait for Jill./* /Jim was planning to stay at the beach all day, but when the crowds arrived he shoved off./