Cheeky or disrespectful replies or comments, especially from someone younger to someone in authority; sassy talking back.
From 'back' + 'chat' (casual conversation). This British informal term originated in the 1800s, literally meaning conversation directed 'back' at someone (a reply), but came to mean impertinent replies.
British English preserves this gem from Victorian times when talking back to your elders was shocking enough to need its own word—today Gen Z would call it being 'sassy' or 'having an attitude.'
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