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pickproof

American  
[pik-proof] / ˈpɪkˌpruf /

adjective

  1. (of a lock) designed so that it cannot be picked. pick.

Etymology

Origin of pickproof

First recorded in 1930–35; pick 1 + -proof

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.