Any process that stops, prevents or reduces the frequency, rate or extent of phenotypic switching.
Synonyms:
exact_synonym:
down regulation of phenotypic switching; downregulation of phenotypic switching
narrow_synonym:
inhibition of phenotypic switching
related_synonym:
down regulation of phenotypic dimorphism; downregulation of phenotypic dimorphism; inhibition of phenotypic dimorphism; negative regulation of phenotypic dimorphism