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hop on(to something)
To get or climb onto something; to board something;. I hopped on my bike and took off for the park. You can hop on the subway at the next stop and meet me in the third car.
See also: hop
hop on (to something)
to jump or get onto something that is moving. Sometimes you have to hop onto the cable car after it has started to move. I ran to the cable car and hopped on.