• veat dead horse,
• neat dead horse,
• heat dead horse,
• geat dead horse,
• bwat dead horse,
• bsat dead horse,
• bdat dead horse,
• brat dead horse,
• b4at dead horse,
• b3at dead horse,
• bezt dead horse,
• best dead horse,
• bewt dead horse,
• beqt dead horse,
• bear dead horse,
• beaf dead horse,
• beag dead horse,
• beay dead horse,
• bea6 dead horse,
• bea5 dead horse

The adverb form for the phrase "beat a dead horse" is "pointlessly" or "futilely". For example, in the sentence "He kept pointlessly beating a dead horse by bringing up the same argument," the adverb "pointlessly" describes how the action of beating the dead horse is done.

The adjective form of "beat dead horse" is "beaten dead horse".