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whip (someone or something) on
1. To strike someone or some animal on a particular part of the body with or as with a whip. He whipped the horse on its flanks, but it refused to move an inch. One of the other boys started whipping Thomas on the butt with a wet, rolled-up towel.
2. To force someone or some animal to continue moving onward by striking them or it with or as with a whip. We were near the point of collapse, but the prison guard whipped us on. You're going to kill that poor donkey with the way you whip it on like that.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
whip someone or something on
to force someone or something to continue by whipping or beating. The rider whipped his horse on, faster and faster. The stage coach driver whipped on the team of horses.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.