We found one dictionary that defines the word be under an impression/belief:

General (1 matching dictionary)

1. be under an impression/belief: Cambridge Advanced Learner's Dictionary

▸ Words similar to be under an impression/belief ▸ Usage examples for be under an impression/belief ▸ Idioms related to be under an impression/belief ▸ Wikipedia articles (New!) ▸ Words that often appear near be under an impression/belief ▸ Rhymes of be under an impression/belief ▸ Invented words related to be under an impression/belief