ÒÅÐßÒÜ ÏÎ×ÂÓ ÏÎÄ ÍÎÃÀÌÈ
[t'er'at' pochvu pod nogami]
To lose the ground under one's feet.
To lose self-confidence in one's occupation, social position or convictions.
Cf. To feel the ground slipping away from under one's feet.