a- + stir
astir (comparative more astir, superlative most astir)
- In motion; characterized by motion.
- 1918, Edgar Rice Burroughs, The Land That Time Forgot Chapter VII
- Wilson, who was acting as cook, was up and astir at his duties in the cook-house. The others slept; but I arose and followed by Nobs went down to the stream for a plunge.