Meanings (ES + gloss)
extenderse • insistir • laborear • labrar • repetir
To discuss or explain (something) excessively or repeatedly; to harp on or overelaborate.
1961, John Fitzgerald Kennedy, inaugural speech Let both sides explore what problems unite us instead of belabouring those problems which divide us.
And so, to belabour the school metaphor, diehard fans of both those fallen leaders resent this pair for snitching in class.