to explain, worry about, or work at (something) repeatedly or more than is necessary

He kept belaboring the point long after we had agreed.

to assail persistently, as with scorn or ridicule

a book that belabors the provincialism of his contemporaries.

to beat vigorously; ply with heavy blows.

Obsolete . to labor at.

verb

beat a dead horse * , go on about , hammer home , overwork , pound , rehash , repeat , assail , assault , baste , batter , buffet , drub , hammer , pummel , smash , thrash , thresh , beat , cudgel , lash , ply , reiterate , work