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1. Literally, to push against a dock in order to move one's boat away from shore. I'll need you to push off while I steer the boat.
2. By extension, to leave or depart. We both need to be up early tomorrow, so we'll be pushing off soon.
push (oneself) off (on something)
[for someone in a boat] to apply pressure to something on the shore, thus propelling the boat and oneself away. The weekend sailor pushed himself off on the boat he had been moored to. We pushed off on the dock.
push someone or something off (of) someone or somethingand push someone or something off
to apply pressure to and force someone or something off someone or something. (Of is usually retained before pronouns.) He continued to come at me, but I managed to push him off me and escape. I pushed off the attacker.
push offand shove off
to leave. (As if one were pushing a boat away from a dock.) Well, it looks like it's time to push off. It's time to go. Let's shove off.
Also, shove off. Leave, set out, depart, as in The patrol pushed off before dawn, or It's time to shove off. This usage alludes to the literal meaning of a person in a boat pushing against the bank or dock to move away from the shore. [Colloquial; early 1900s]
1. To shove or thrust something or someone from a place: She climbed up to the roof and pushed off the snow. He pushed a glass off the table, and it shattered.
2. To set out; depart: The infantry patrol pushed off before dawn.
3. To launch or move away by pushing against a surface: I can jump higher when I push off the ground with my left foot. We got in the boat and pushed off from the dock.