pileyoudaoicibaDictYouDict[pile 词源字典]
pile: English has three words pile. The commonest, ‘heap’ [15], originally meant ‘pillar’. It comes ultimately from Latin pīla ‘pillar’, source also of English pilaster, pillar, etc. This evolved in meaning to ‘pier or harbour wall made of stones’, and inspired a derived verb pīlāre ‘heap up’ (source of English compile [14]).

The sense ‘heap’ came to the fore in Old French pile, and passed into English. Pile ‘post driven into the ground’ [OE] was borrowed into Old English from Latin pīlum ‘javelin’. It was originally used for a ‘throwing spear’, ‘arrow’, or ‘spike’, and its present-day use did not emerge (via ‘pointed stake or post’) until the Middle English period. Pile ‘nap on cloth, carpets, etc’ [15] probably comes via Anglo-Norman pyle from Latin pilus ‘hair’ (which may be distantly related to English pillage and pluck, and lies behind English depilatory [17]).
=> compile, pilaster, pillar; depilatory[pile etymology, pile origin, 英语词源]
pile (n.1)youdaoicibaDictYouDict
"mass, heap," early 15c., originally "pillar, pier of a bridge," from Middle French pile and directly from Latin pila "stone barrier, pillar, pier" (see pillar). Sense development in Latin from "pier, harbor wall of stones," to "something heaped up." In English, sense of "heap of things" is attested from mid-15c. (the verb in this sense is recorded from mid-14c.). The meaning "large building" (late 14c.) is probably the same word.
pile (n.2)youdaoicibaDictYouDict
"heavy pointed beam," from Old English pil "stake," also "arrow," from Latin pilum heavy javelin of the Roman foot soldier, literally "pestle" (source of Old Norse pila, Old High German pfil, German Pfeil "arrow"), of uncertain origin.
pile (n.3)youdaoicibaDictYouDict
"soft, raised surface upon cloth," mid-14c., "downy plumage," from Anglo-French pyle or Middle Dutch pijl, both from Latin pilus "a hair" (source of Italian pelo, Old French pel). Phonological evidence rules out transmission of the English word via Old French cognate peil, poil. Meaning "nap upon cloth" is from 1560s.
pile (v.)youdaoicibaDictYouDict
"to heap up," mid-14c.; see pile (n.1). Related: Piled; piling. Figurative verbal expression pile on "attack vigorously, attack en masse," is from 1894, American English.