This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. To attack with blows; hit, beat, or whip. See Synonyms at beat.

v. To assail verbally.

v. To discuss repeatedly or at length; harp on: Don't belabor the point.

v. Alternative spelling of belabour.

v. To ply diligently; to work carefully upon.

v. To beat soundly; to cudgel.

To work hard upon; ply diligently.

To beat soundly; thump.

v. attack verbally with harsh criticism

v. to work at or to absurd length

v. beat soundly

"He tends to find a point in his case (and in both books, the point he chooses to belabor is ridiculous and would not BE a point in a real case of law) and go over and over and over that point ad nauseum until you want to scream."

belabors   

knock    criticize    criticise    pick apart    work at    work on    beat    work over    beat-up   

cudgel    beat    ply   

Aber    Baber    Haber    Labor    Labour    Sabir    aber    faber    labor    labour