BELABOR

BELABOR      :   (bi LAY BUR)

 To go over repeatedly or to an absurd manner

Memory key

See it BELL+ABHOR. 

Imagine a bell was making you to hate since it was repeatedly ringing in absurd manner.

Or


BEL+A+BORE. bell was boring you by repeatedly ringing.

Example

He spent his whole life belaboring obvious things.