If something slips under the radar, it isn't detected or noticed.
be off the radar
To go ignored, unnoticed, or appreciated; to not be relevant, prominent, or important. Though they've been abounding music-makers for years, their assignment has abundantly been off the alarm for best admirers until absolutely recently.Even admitting homelessness can be apparent as one of the better basal causes of civic ills, it is acutely aloof off the government's radar.Learn more: off, radarLearn more:
An be off the radar idiom dictionary is a great resource for writers, students, and anyone looking to expand their vocabulary. It contains a list of words with similar meanings with be off the radar, allowing users to choose the best word for their specific context.
類似の言葉の辞書、別の表現、同義語、イディオム イディオム be off the radar