fess in English

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expr. fess up, to admit the truth of something.
Ex. The joke is on him and he may as well fess up to it (Randolph Enterprise).

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expr. in fess, lying in the middle of the fess, horizontally across the middle of the field.
Ex. In the arms of Bowes the three bows placed erect and side by side are palewise in fess (C. W. Scott-Giles).

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expr. per fess, (of the shield) divided by a horizontal line through the middle.
Ex. an ordinary per fess argent and sable.

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fess (1)orfesse, noun.
(Heraldry.) a wide, horizontal band across the middle of a shield.

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fess (2)or'fess, transitive verb, intransitive verb.
(Slang.) to confess.