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petrel [petrel 词源字典]: petrel: [17] The petrel, a gull-like seabird, is alleged to have been named after the apostle Peter, supposedly inspired by the resemblance between the petrel’s habit of flying close to the surface of the sea and touching it with its feet, and Peter’s reported feat of walking on the water, as reported in Matthew 14:29 – ‘And when Peter was come down out of the ship, he walked on the water, to go to Jesus’
[petrel etymology, petrel origin, 英语词源]
acquainted (adj.): early 13c., "personally known;" past participle adjective from acquaint (v.). Of skills, situations, etc., from late 15c.
I have been one acquainted with the night.
I have walked out in rain â- and back in rain.
I have outwalked the furthest city light.

[Robert Frost, from "Acquainted with the Night"]
walk (v.): "travel on foot," c. 1200, a merger of two verbs, 1. Old English wealcan "to toss, roll, move round" (past tense weolc, past participle wealcen), and 2. wealcian "to roll up, curl," from Proto-Germanic *welk- (cognates: Old Norse valka "to drag about," Danish valke "to full" (cloth), Middle Dutch walken "to knead, press, full" (cloth), Old High German walchan "to knead," German walken "to full"), perhaps ultimately from PIE root *wel- (3) "to turn, roll" (see volvox).

The shift in sense is perhaps from a colloquial use of the Old English word or via the sense of "to full cloth" (by treading on it), though this sense does not appear until after the change in meaning. In 13c. it is used of snakes and the passage of time, and in 15c. of wheeled carts. "Rarely is there so specific a word as NE walk, clearly distinguished from both go and run" [Buck]. Meaning "to go away" is recorded from mid-15c. Transitive meaning "to exercise a dog (or horse)" is from late 15c.; meaning "to escort (someone) in a walk" is from 1620s. Meaning "move (a heavy object) by turning and shoving it in a manner suggesting walking" is by 1890. To walk it off, of an injury, etc., is from 1741. Related: Walked; walking.