grey knight
noun[C]
FINANCEUK(USgray knight)ukusapossiblebuyerof acompanywhotakesadvantageofproblemsbetween thecompanyand anotherpossiblebuyerinorderto takecontrolof thecompany:
Agrayknightis apotentialacquirerwhooutbidsawhiteknightin ahostiletakeover.
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black knight
white knight