Here are some examples of how it's used:
* "Plans are afoot for a new park in the neighborhood." (The planning is happening.)
* "The investigation is afoot, and the police are interviewing witnesses." (The investigation is taking place.)
* "There's a lot of excitement afoot with the upcoming holiday." (The excitement is present and increasing.)
It's important to note that "afoot" is not a synonym for "on foot." While "on foot" describes the way someone is traveling, "afoot" describes an activity or process.