Like a muddied spring or a polluted well are the righteous who give way to the wicked.
OJBA tzaddik who falters before the rasha is like a muddy spring, and a polluted makor (fountain).
T4TWhen a righteous/good person ◄gives in/yields► to wicked people, that is as bad as [SIM] a spring that becomes muddied or a fountain that becomes polluted.