in broad daylight
US /ɪn brɔd ˈdaɪt.laɪt/
UK /ɪn brɔd ˈdaɪt.laɪt/

1.
en plein jour, ouvertement
during the day, when it is easy to see what is happening, often used to express surprise or shock that something illegal or inappropriate occurred openly
:
•
The robbery happened in broad daylight, right on the main street.
Le vol a eu lieu en plein jour, en pleine rue principale.
•
I can't believe they were arguing so loudly in broad daylight.
Je n’arrive pas à croire qu’ils se disputaient si fort en plein jour.