Fess definitions

fĕs
To admit to something; confess, often used with up:
verb
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A wide horizontal band forming the middle section of an escutcheon.
noun
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A horizontal band forming the middle third of a shield.
noun
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To confess; to admit.
verb
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(heraldry) A horizontal band across the middle of the shield.
noun
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Origin of fess

Middle English fesse from Old French from Latin fascia band