He unbuckles his seatbelt the moment the taxi pulls up.

The flight attendant counted the unbucklings of the passengers during the emergency drill to ensure everyone knew how to respond.

Please unbuckle your seat belt before exiting the vehicle.

Feeling anxious, she kept unbuckling her seatbelt despite the driver's warnings.

Her unbuckling of the child's car seat took longer than expected, but she finally buckled him in with a smile.

The child's unbuckled seatbelt worried his mother during the drive.

After the long flight, she unbuckled her seatbelt and sighed with relief.