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1913, agent noun from hike (v.). Earlier as a type of boat:
The "hiker" or "tuck-up" as it is more generally termed, is a craft peculiar to the Delaware River, and is to the youth residing along the banks of that stream what the racing shell is to the Torontonian .... The origin of the name "hiker" is veiled in mystery. No member of the clubs engaged in sailing these boats can give anything like a satisfactory derivation of the word. The most common explanation is that it is corrupted from the local verb "to hike," which means to run or fly swiftly. ["Harper's Young People," 1885]
1809, hyke "to walk vigorously," an English dialectal word of unknown origin. A yike from 1736 answers to the sense.
HIKE, v. to go away. It is generally used in a contemptuous sense. Ex. "Come, hike," i.e. take yourself off; begone. [Rev. Robert Forby, "The Vocabulary of East Anglia," London, 1830]Sense of "pull up" (as pants) first recorded 1873 in American English, and may be a variant of hitch; extended sense of "raise" (as wages) is 1867. Related: Hiked; hiking. The noun is from 1865.
: The government got a big tax hikeverb
[fr mid-1800s term hike up, ''go or raise up,'' related to hoick of the same meaning, both probably fr the asi dialectal sense ''go, go about'']