A shield or emblem bearing a coat of arms; a plate around a keyhole, door handle, or light switch.
From Latin 'scutum' (shield). 'A blot on one's escutcheon' means a stain on one's reputation — your personal shield is damaged.
Your family shield! But ALSO the metal plate around a keyhole! The phrase 'a blot on your escutcheon' means your reputation has a stain! Your honor is literally a SHIELD and someone just dented it! 🛡️😬
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