You can’t hold with the hare and run with the hounds

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It is impossible placate both sides of a conflict and remain on good terms with each

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John Heywood’s 1546 glossary A Dialogue conteinyng the nomber in effect of all the Prouerbes in the Englishe tongue: There is no mo [more] suche tytifils [scoundrels] in Englands grounde, To holde with the hare, and run with the hounde