One of the mysteries of the English language finally explained.
Of two or more shields or other armorial bearings: displayed side by side, sometimes leaning towards each other and with the sides overlapping.
Mid 17th century (in an earlier sense). From French accollé, past participle of accoller, in specific senses ‘to be around someone's neck’, ‘to put (something) around someone's neck’, (in past participle) ‘placed side by side and touching’.
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