stroke: The verb stroke [OE] and the noun stroke [13] are different words, but they come ultimately from the same source – the prehistoric Germanic base *strīk-, *straik- ‘touch lightly’ (from which English also gets streak and strike). The verb has stayed very close semantically to its source, whereas the noun has followed the same path as its corresponding verb strike. => streak, strike[stroke etymology, stroke origin, 英语词源]