B1
for or during the night
Dictionary examples:
My overnight face mask scared the hotel staff in the morning. (0.0)
I packed an overnight bag full of snacks and no clothes. (0.0)
I forgot my overnight pajamas and slept in a potato sack. (0.0)
You can stay overnight if you want to. (32.6)
Don't forget to pack an overnight bag. (32.7)
an overnight stop in Paris (33.4)