Etymology
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Words related to through

*tere- (2)

*terə- Proto-Indo-European root meaning "cross over, pass through, overcome."

It forms all or part of: avatar; caravanserai; nectar; nectarine; nostril; seraglio; thrill; thorough; through; tranche; trans-; transient; transom; trench; truculent; truncate; trunk.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit tirah, Avestan taro "through, beyond;" Latin trans "beyond;" Old Irish tre, Welsh tra "through;" Old English þurh "through."

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thorough (adj.)
c. 1300, adjectival use of Old English þuruh (adv.) "from end to end, from side to side," stressed variant of þurh (adv., prep.); see through. Related: thoroughly; thoroughness.
breakthrough (n.)
also break-through, 1918, in a military sense, from the verbal phrase; see break (v.) + through (adv.). The verbal phrase is attested from c. 1400 in the sense "overcome or penetrate a barrier." Meaning "abrupt solution or progress" is from 1930s, on the notion of a successful attack.
drive-through (adj.)

"that may be used or experienced while driving a car," 1949 (in an advertisement for the Beer Vault Drive-Thru in Ann Arbor, Michigan), from the verbal phrase; see drive (v.) + through (adv.).

follow-through (n.)
1896, of golf swings, from verbal phrase follow through; see follow (v.) + through (adv.). Figurative use from 1926.
go through (v.)
"to execute, carry to completion" (a plan, etc., often with with), 1560s; see go (v.) + through (adv.). Meaning "to examine" is 1660s; "to endure, suffer, undergo" is by 1712; "to wear out" (of clothes, etc.) by 1959.
run-through (n.)

"a rehearsal," especially a hasty one, 1923, from the verbal phrase; see run (v.) + through (adv.). The verbal phrase is attested by mid-15c. as "examine, inspect;" by 1670s as "read over rapidly." Its sense of "to pierce or stab through the body" is from late 15c.

see-through (adj.)
1950, from the verbal phrase (c. 1400); see see (v.) + through (adv.).
thro (prep.)
shorter spelling of through.
throughly (adv.)
"fully, completely," mid-15c., from through + -ly (2). Archaic alternative to thoroughly.