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To change to a lower gear while driving. You'll probably need to change down to first gear to climb this steep hill.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
To switch to a lower gear when driving a motor vehicle: The driver changed down to third gear coming into the turn.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.