potkopati

1. to undermine
   Ta afera je potkopala njegov ugled. — That scandal undermined his reputation.
   Stalne svađe su potkopale poverenje u timu. — Constant quarrels undermined trust within the team.
2. to dig under
   Radnici su potkopali temelje stare zgrade. — The workers dug under the foundations of the old building.

The imperfective is potkopavati.