bubble under the radar
US /ˈbʌbəl ˈʌndər ðə ˈreɪdɑːr/
UK /ˈbʌbəl ˈʌndər ðə ˈreɪdɑːr/

1.
estar sob o radar, passar despercebido, desenvolver-se discretamente
to be present or active but not widely known or noticed
:
•
The new startup has been bubbling under the radar for months, but now they're ready to launch.
A nova startup tem estado sob o radar por meses, mas agora eles estão prontos para lançar.
•
Despite his talent, the artist has been bubbling under the radar, waiting for his big break.
Apesar do seu talento, o artista tem estado sob o radar, esperando sua grande chance.