To cover someone, something, or oneself in soap. A noun or pronoun can be used between "soap" and "up." To conserve hot water, I turn the shower off while I soap up and then turn it back on to rinse off. Our dog hates it when we soap him up for his bath.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
1. To cover someone or something with soap: We soaped up the car, scrubbed well, and rinsed it clean. I soaped my legs up and shaved them.
2. To cover oneself with soap: I soaped up and rinsed off in the shower.
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.