dock (n.1)

"ship's berth," late 15c., from Middle Dutch or Middle Low German docke, perhaps ultimately (via Late Latin *ductia "aqueduct") from Latin ducere "to lead," from PIE root *deuk- "to lead;" or possibly from a Scandinavian word for "low ground" (compare Norwegian dokk "hollow, low ground"). Original sense perhaps "furrow a grounded vessel makes in a mud bank." As a verb from 1510s. Related: Docked; docking.

dock (n.2)

"where accused stands in court," 1580s, originally rogue's slang, from Flemish dok "pen or cage for animals," origin unknown.

dock (n.3)

name for various tall, coarse weeds, Old English docce, from Proto-Germanic *dokkon (source also of Middle Dutch docke-, German Docken-, Old Danish dokka), akin to Middle High German tocke "bundle, tuft," and ultimately to the noun source of dock (v.).

dock (v.)

"cut an animal's tail," late 14c., from dok (n.) "fleshy part of an animal's tail" (mid-14c.), related to Old English -docca "muscle," from Proto-Germanic *dokko "something round, bundle" (source also of Old Norse dokka "bundle, girl," Danish dukke "doll," German Docke "small column, bundle, doll, smart girl"). Meaning "to reduce (someone's) pay for some infraction" is first recorded 1822. Related: Docked; docking.