Used to describe activities currently happening or being planned. You've arrived at the perfect time, something exciting is afoot!
Pro Tip 2/3
Slight Secrecy
Suggests that there is a hint of secrecy, or something is not completely obvious. She entered the room and immediately sensed that there was mischief afoot.
Pro Tip 3/3
Potential Change
Indicates that change could be happening soon. With the new management, there are changes afoot in our company's policies.