British spelling of chiseling; cutting with a chisel or figuratively cheating someone through small deceits.
From chisel with British spelling conventions adding double-l before the -ing suffix, though British English doesn't require the doubling for this word (unlike chiselled/chiseled).
Interestingly, British English writes 'chiselling' with double-L even though this isn't required by the doubling rule—it shows how spelling conventions aren't always perfectly consistent even within one dialect!
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