buckle up
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Fasten a seat belt, as in All the children must learn to buckle up as soon as they get in a car. This term came into wide use in the second half of the 1900s, when seat belts became mandatory automobile equipment. Earlier they had been used mainly in airplanes.
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Words nearby buckle up
buckle, buckle down, buckler, buckler fern, buckle under, buckle up, Buckley, Buckley's chance, buckling, buckminsterfullerene, buck moth
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.