To pry something upward with or as with a jemmy (a short crowbar). A noun or pronoun can be used between "jemmy" and "up." ("Jemmy" is a British-English variant of "jimmy.") Primarily heard in UK. I set about jemmying up all the rotting floorboards on the patio. See if you can jemmy the lid of the container up with a screwdriver. I'm dying to find out what's inside!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.