under-the-radar

US /ˈʌndər ðə ˈreɪdɑːr/
UK /ˈʌndər ðə ˈreɪdɑːr/
"under-the-radar" picture
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.