under-the-radar
US /ˈʌndər ðə ˈreɪdɑːr/
UK /ˈʌndər ðə ˈreɪdɑːr/
1.
not attracting much attention; unnoticed or secret
:
•
The small, independent film was an under-the-radar hit.
•
They prefer to keep their relationship under-the-radar.
not attracting much attention; unnoticed or secret