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

1.
白昼堂々, 公然と
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.
強盗は白昼堂々、大通りで起こった。
•
I can't believe they were arguing so loudly in broad daylight.
彼らが白昼堂々と大声で口論していたなんて信じられない。