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through

/θruː/

From one side, end, or stage to another

From Proto-Indo-European *terh₂- / *tere- (to cross over) + Proto-Indo-European *terh₃u- (to rub).

preposition
adverb
adjective
noun
*terh₂- / *tere-
Proto-Indo-European
Verified
*tr̥h₂kʷe; related to *terh₂-
reconstructed
‘to pass through’; the source of the Germanic preposition

from Proto-Indo-European *terh₃u- (“to rub, turn, drill, bore”). Not directly related with German Truhe (“chest”),...

Proto-Germanic
Verified
*þurhw
reconstructed
‘through’

from Old English þurh

+1 more source
Old English
Verified
þurh
‘through’

from Old English þurh

+1 more source
Middle English
Verified
thurgh, thrugh, thruch, thruh
Metathetic forms; the consonants shift position

from Middle English thrugh, thruch, thruh, metathetic variants of thurgh, thurh

*terh₃u-
Proto-Indo-European
Verified
*terh₃u-
reconstructed
‘to rub, turn, drill, bore’

from Proto-Indo-European *terh₃u- (“to rub, turn, drill, bore”). Not directly related with German Truhe (“chest”),...

Proto-Germanic
Verified
*þrūhs
reconstructed
‘hollowed-out wood’

from Old English þrūh (“trough, conduit, pipe; box, chest; coffin, tomb”)

Old English
Verified
þrūh
‘trough, conduit, pipe; box, chest; coffin, tomb’

from Old English þrūh (“trough, conduit, pipe; box, chest; coffin, tomb”)

Middle English
AI-inferred
þrouȝ, throgh
A related-looking form that may have influenced through
Modern English
through

A person walking through a doorway is using a word whose ancestors were already imagining passage from one side to another. Old English þurh eventually became Middle English thurgh and then thrugh, with the sounds swapping places in a small linguistic shuffle called metathesis. The same Germanic family includes German durch and Dutch door—so a modern door is, etymologically speaking, the thing you go through. There is also an old near-twin lurking in the evidence: Old English þrūh meant a hollowed-out wooden channel, box, or coffin, and its forms may have tugged on the history of through, though the two roots are not directly the same. By 1798, American English was using through for a complete span such as “January through December,” and the word still carries both a journey and its finish: you go through something, then you are through with it.

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