To apply water or another liquid to something, especially hair, in order to make it remain lying flat. A noun or pronoun can be used between "wet" and "down." My mom made me wet my hair down for the school photographs. He wetted the decals down with a sticky substance to stop them from peeling up from the side of the car.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
wet someone or something down
to put water onto someone or something. Mother wet the children down with a hose while she was washing the car. Karen wet down the children with the hose. We wet the new concrete down to help it cure in all the heat.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
1. To wet the surface of something entirely: The painter wet down the canvas. We wet the car down before applying the soap.
2. To cause something to bend down or lie flat by making it wet: I wet down my hair so that it wouldn't stick up. The heavy dew wet the grass down flat.
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.