Source : Webster's Revised Unabridged Dictionary (1913)

Astir \A*stir"\, adv. & a. [Pref. a- + stir.]
   Stirring; in a state of activity or motion; out of bed.

Source : WordNet®

astir
     adj 1: out of bed; "are they astir yet?"; "up by seven each
            morning" [syn: {astir(p)}, {up(p)}]
     2: on the move; "up and about"; "the whole town was astir over
        the incident" [syn: {about(p)}, {astir(p)}]