The seatbelt sign is the lit symbol telling you to fasten up. Watch the seatbelt sign.
It goes on for turbulence the crew can see coming, which is not all turbulence. Most injuries in flight happen to people who ignored the seatbelt sign.
1nounseatbelt signThe lit symbol telling you to fasten up.
“The seatbelt sign stayed on for the whole crossing.”
seatbelt sign is a sign.
Practised in Airport & Flying