We found one dictionary that defines the word to be off the radar screen:

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1. to be off the radar screen: Collins English Dictionary

▸ Words similar to to be off the radar screen ▸ Usage examples for to be off the radar screen ▸ Idioms related to to be off the radar screen ▸ Wikipedia articles (New!) ▸ Words that often appear near to be off the radar screen ▸ Rhymes of to be off the radar screen ▸ Invented words related to to be off the radar screen