belt (n.)youdaoicibaDictYouDict
Old English belt "belt, girdle," from Proto-Germanic *baltjaz (cognates: Old High German balz, Old Norse balti, Swedish bälte), an early Germanic borrowing from Latin balteus "girdle, sword belt," said by Varro to be an Etruscan word.

As a mark of rank or distinction, mid-14c.; references to boxing championship belts date from 1812. Mechanical sense is from 1795. Transferred sense of "broad stripe encircling something" is from 1660s. Below the belt "unfair" (1889) is from pugilism. To get something under (one's) belt is to get it into one's stomach. To tighten (one's) belt "endure privation" is from 1887.
bumpy (adj.)youdaoicibaDictYouDict
1865, from bump + -y (2).
Fasten your seatbelts. It's going to be a bumpy night. [Bette Davis ("Margo Channing"), "All About Eve," 1950]
Related: Bumpiness.
Van AllenyoudaoicibaDictYouDict
name of radiation belts around the Earth (and certain other planets), 1959, from U.S. physicist James A. Van Allen (1914-2006), who reported them in 1958.
trade windyoudaoicibaDictYouDict
"A wind blowing steadily towards the equator from the north-east in the northern hemisphere or the south-east in the southern hemisphere, especially at sea. Two belts of trade winds encircle the earth, blowing from the tropical high-pressure belts to the low-pressure zone at the equator", Mid 17th century: from the phrase blow trade 'blow steadily in the same direction'. Because of the importance of these winds to navigation, 18th-century etymologists were led erroneously to connect the word trade with ‘commerce’.