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The smug, annoying voice someone uses when they catch you in a lie, usually with the word 'actually' like they're the only one who knows the truth.
'Actually, I didn't fail the test, I just didn't show up.', my dad, after I got a zero.
'Actually, I didn't eat your pizza, I just ate it and forgot.', my sister, who eats my pizza every day.
'Actually, I didn't break your phone, I just threw it at the wall and it broke.', my brother, who broke my phone.