シートベルトを締めてください。

seat belt; seatbelt

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to tie; to fasten; to total; to sum; to be strict with; to economize; to economise; to cut down on; to salt; to marinate; to pickle; to make sushi adding a mixture of vinegar and salt; to wear (necktie); to put on (necktie)

to give; to confer; to bestow; to kindly do for one; to oblige; to favour; to favor