In heraldry, an animal depicted standing upright or rearing on its hind legs with a proud posture.
From Old French 'debout' meaning 'standing up' or 'upright', from 'de-' + 'bout' (end, extremity). Used in heraldic descriptions since medieval times to denote the stance of animals on coats of arms.
Medieval heralds used 'debout' to make lions and horses look more fierce and noble on shields and banners—a 'debout' lion looks way more impressive than one standing calmly. It's medieval marketing for your family symbol.
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