British spelling of chiseler; a person who cheats or swindles others, or one who uses a chisel tool.
From chisel plus -er suffix, with British English preserving the double-l (chiseller) before the suffix following British spelling conventions.
The British/American spelling difference (chiseller vs. chiseler) shows how the two languages diverged—British English doubled the L while American English kept it simple, a pattern that shows up in other words like 'traveller' vs. 'traveler'!
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