Etymology
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astir (adv.)

"up and about," 1799, Scottish English, from phrase on the stir, or from Scottish asteer; from a- (1) + stir (see stir (v.)). Old English had astyrian, which yielded Middle English ben astired "be stirred up, excited, aroused."

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Definitions of astir

astir (adj.)
on the move;
the whole town was astir over the incident
Synonyms: about
astir (adj.)
out of bed;
are they astir yet?
Synonyms: up
From wordnet.princeton.edu