- tread[tread 词源字典]
- tread: [OE] Tread comes from a prehistoric Germanic *trethan, which also produced German treten, Dutch treden, Swedish träda, and Danish træde. It does not appear to have any relations outside Germanic, however. Trade comes from the same base, and it is thought that trot  may do so too, although its immediate source was Old French troter.
=> trade, trot[tread etymology, tread origin, 英语词源]
- tread (v.)
- Old English tredan "to tread, step on, trample; traverse, pass over" (class V strong verb; past tense træd, past participle treden), from Proto-Germanic *tred- (cognates: Old Saxon tredan, Old Frisian treda, Middle Dutch treden, Old High German tretan, German treten, Gothic trudan, Old Norse troða), from PIE *der- (1) "assumed base of roots meaning 'to run, walk, step'" [Watkins]. Related: Trod; treading.
- tread (n.)
- early 13c., "a step or stepping, pressure with the foot," from tread (v.); in reference to automobile tires, it is recorded from 1906.