on the spot

Từ điển Oxford Advanced Learner 8th

on the ˈspot idiom
1. immediately
•He answered the question on the spot.
•an on-the-spot parking fine
2. at the actual place where sth is happening
•An ambulance was on the spot within minutes.
•an on-the-spot report
3. (NAmE also in ˈplace)in one exact place, without moving in any direction
•Running on the spot is good exercise.
Main entry: ↑spot_idiom