belt up
US /belt ʌp/
UK /belt ʌp/

1.
系好安全带
to fasten your seatbelt in a car or aircraft
:
•
Make sure everyone belts up before we start driving.
开车前请确保每个人都系好安全带。
•
The flight attendant reminded passengers to belt up for landing.
空乘人员提醒乘客在降落时系好安全带。