under-the-radar
US /ˈʌndər ðə ˈreɪdɑːr/
UK /ˈʌndər ðə ˈreɪdɑːr/

1.
tidak menarik perhatian, di bawah radar, rahsia
not attracting much attention; unnoticed or secret
:
•
The small, independent film was an under-the-radar hit.
Filem bebas kecil itu adalah kejayaan di bawah radar.
•
They prefer to keep their relationship under-the-radar.
Mereka lebih suka merahsiakan hubungan mereka di bawah radar.