pettifog

verb2

1. •
   To quibble over trivial matters; nitpick.

   • Don't pettifog or we will soon grow weary.
2. •
   To do a petty business as a lawyer, or carry out law business in a petty or tricky way.

   • He is a common barreter for his pleasure, that takes no money, but pettifogs gratis. — 1840