Etymology
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coat of arms (n.)

mid-14c., also simply coat (mid-14c.); originally a tunic embroidered or painted with heraldic armorial bearings (worn over armor, etc); see coat (n.) + arm (n.2) and compare Old French cote a armer. Sense transferred in Middle English to the heraldic arms themselves. Hence turncoat, one who put his coat on inside-out to hide the badge of his loyalty (1550s).

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Definitions of coat of arms

coat of arms (n.)
the official symbols of a family, state, etc.;
Synonyms: arms / blazon / blazonry
From wordnet.princeton.edu

Dictionary entries near coat of arms

coast guard

coastal

coaster

coastline

coat

coat of arms

coati

coating

coat-tail

co-author

coax