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impale (someone, something, or oneself) on (something)
1. To stab someone or something with something. They used to impale their victims on pikes, I swear!
2. To be stabbed with or by something. In this usage, a noun or pronoun is used between "impale" and "on." You're going to impale yourself on one of those sharp rocks if you're not careful!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
impale someone or something on something
to put someone or something on a pointed object and press down. The crowd had impaled an effigy of the dictator on a sharpened stick. The waves almost impaled me on a submerged tree branch.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.