1) Active, per Holmes 2) Astir 3) Astir, or walking 4) Brewing 5) Currently going on 6) Currently in progress 7) Exclusively Anglo word 8) Exclusively Saxon word 9) Going on 10) Going on a short distance 11) Going on in the vicinity 12) Going on, to Holmes 13) Going on, to sherlock 14) Happening 15) Happening now 1) Astir 2) Current 3) Moving 4) Underway 5) À pied 
• (adv.) On foot. • (adv.) Fig.: In motion; in action; astir; in progress.
A·foot' adverb [ Prefix a- + foot .] 1. On foot. « We 'll walk afoot a while. Shak. » 2. Fig.: In motion; in action; astir; in progress. « The matter being afoot . Shak. » 
[adv] - on foot
on foot; walking: I came afoot. · astir; in progress: There is mischief afoot.