the modern verb is a merger of two related Old English words, in both of which the first letters sometimes switched places. The first is intransitive rinnan, irnan "to run, flow, run together" (past tense ran, past participle runnen), cognate with Middle Dutch runnen, Old Saxon, Old High German, Gothic rinnan, German rinnen "to flow, run."
The second is Old English transitive weak verb ærnan, earnan "ride, run to, reach, gain by running" (probably a metathesis of *rennan), from Proto-Germanic *rannjanan, causative of the root *ren- "to run." This is cognate with Old Saxon renian, Old High German rennen, German rennen, Gothic rannjan.
Both are from PIE *ri-ne-a-, nasalized form of root *rei- "to run, flow"
Of streams, etc., from c. 1200; of machinery, from 1560s. Meaning "be in charge of" is first attested 1861, originally American English. Meaning "seek office in an election" is from 1826, American English. Phrase run for it "take flight" is attested from 1640s. Many figurative uses are from horseracing or hunting (such as to run (something) into the ground, 1836, American English).
To run across "meet" is attested from 1855, American English. To run short "exhaust one's supply" is from 1752; to run out of in the same sense is from 1713. To run around with "consort with" is from 1887. Run away "flee in the face of danger" is from late 14c. To run late is from 1954.
"a spell of running," mid-15c. (earlier ren, late 14c.), from run (v.). The Old English noun ryne meant "a flowing, a course, a watercourse." Modern sense of "small stream" first recorded 1580s, mostly Northern English dialect and American English.
Meaning "continuous stretch" (of something) is from 1670s. Meaning "series or rush of demands on a bank, etc." is first recorded 1690s. Meaning "the privilege of going through or over" is from 1755. Baseball sense is from 1856. Meaning "single trip by a railroad train" is from 1857. Military aircraft sense is from 1916. Meaning "total number of copies printed" is from 1909. Meaning "tear in a knitted garment" is from 1922. Phrase a run for one's money is from 1872 in a figurative sense, originally from horse racing, implying competition (1841).