climb on

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climb on(to) (someone or something)

To mount someone or something. We can reach the cookies on that shelf if you climb on my back. I was nervous, but I climbed onto the horse nonetheless.
See also: climb

climb on(to) something

 and climb on
to ascend to or mount something. I climbed onto the side of the truck. Tommy climbed on the truck.
See also: climb, on