yegg

[ yeg ]
/ yɛg /

noun Slang.

a safecracker.
an itinerant burglar.
a thug.

Origin of yegg

1925–30, Americanism; of obscure origin; the proposals that the word is < German Jäger “hunter” or that it is the surname of a well-known safecracker are both very dubious
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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British Dictionary definitions for yegg

yegg
/ (jɛɡ) /

noun

slang, mainly US a burglar or safe-breaker

Word Origin for yegg

C20: perhaps from the surname of a burglar
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012