Origin of buckle

1300–50; Middle English bocle < Anglo-French bo(u)cle, bucle < Latin buc(c)ula cheekpiece (of a helmet), strip of wood, etc., resembling a cheekpiece, equivalent to bucc(a) cheek + -ula -ule

SYNONYMS FOR buckle

OTHER WORDS FROM buckle

buck·le·less, adjective re·buck·le, verb, re·buck·led, re·buck·ling.

British Dictionary definitions for buckle up

buckle
/ (ˈbʌkəl) /

noun

a clasp for fastening together two loose ends, esp of a belt or strap, usually consisting of a frame with an attached movable prong
an ornamental representation of a buckle, as on a shoe
a kink, bulge, or other distortion a buckle in a railway track

verb

to fasten or be fastened with a buckle
to bend or cause to bend out of shape, esp as a result of pressure or heat

Word Origin for buckle

C14: from Old French bocle, from Latin buccula a little cheek, hence, cheek strap of a helmet, from bucca cheek

Idioms and Phrases with buckle up

buckle up

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.