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1. To approach someone or something on horseback. The sheriff rode up to see what the two suspicious characters were up to.
2. To gradually move or slide upward on one's body, especially when becoming wedged some place or bunched together. My underwear keeps riding up and giving me a wedgie! I really love this dress, but it keeps riding up on me whenever I stand up.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
ride up(on someone)
1. Lit. [for someone on a horse] to approach someone, riding. I rode up on him and frightened him. I guess I was in the house when you rode up.
2. Fig. [for clothing, especially underpants] to keep moving higher on one's body. I don't like it when my pants ride up on me. I hate it when my underpants ride up.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
Gradually move upward from a normal position, as in This skirt is too tight and it constantly rides up. [Mid-1800s]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
To slide upward across the surface of something and become bunched together. Used especially of fabric or clothing: My sleeves always ride up my arms when I wear this coat. I don't like this brand of underwear—they ride up and are really uncomfortable.
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.