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wasn't

/ˈwʌzənt/

Contraction meaning “was not” in English

From O.English, from Proto-Germanic was (Past-tense form of “be”) + Modern English n't (Contracted form of the negative particle not).

verb
was
Proto-Indo-European
*h₂wes-
“to reside, remain, dwell”
Proto-Germanic
*was
Past-tense form associated with being
Old English
wæs
First- and third-person singular past form of wesan
Middle English
was
Past form of am; increasingly replacing the older verb wesan
n't
Modern English
not
Negative particle
Modern English
-n't
Reduced clitic attached to an auxiliary verb
Combined
was + not → wasn't
The auxiliary was combines with the negative particle not; not reduces phonologically to -n't.
Modern English
wasn't
Negative past-tense auxiliary meaning “was not”
Modern English
wasn't

English “to be” is a grammatical patchwork assembled from several ancient verbs, and was is the piece that originally meant “remain” or “dwell.” Its ancestor, Proto-Indo-European *h₂wes-, is related to Sanskrit vasati, “he dwells,” and to Latin vestal—the Vestal Virgins were guardians of a sacred fire that had to keep abiding. In Old English, wæs belonged to wesan, a separate verb, but it gradually took over the past tense of am; English essentially recycled an old “remain” verb to say that someone existed in the past. The negative half is much less glamorous but wonderfully efficient: not shrank into the clitic -n't, producing wasn't. So when you say “She wasn't there,” you are combining an ancient idea of dwelling with a medieval-to-modern habit of squeezing negation onto the auxiliary—absence expressed by a verb whose deepest ancestor meant staying put.

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