don't unfasten your seat belt

См. также в других словарях:

• fasten — 01. Please [fasten] your seatbelts in preparation for landing. 02. I pinched myself under the chin when I was [fastening] my bicycle helmet. 03. The shoestring was invented in England in 1790; before this, all shoes were [fastened] with buckles.… …   Grammatical examples in English