1. immediately.

Huge numbers of people donated blood on the spot.

We fell in love with the puppy and bought him on the spot.

2. in the place where something has just happened.

Police arrested the robber on the spot.

• John Bull
• John Doe
• John Hancock
• Johnny-come-lately
• Johnny-on-the-spot
• John Q Public
• joie de vivre
• joined at the hip
• join hands
• join hands with
• join hands with someone
• join in
• Join the club!
• join the fray
• join the ranks of
• join the ranks of something
• join up
• joker in the pack
• joke's on
• joke's on someone
• judgment call
• juggling act
• juice up
• juice up something
• jump all over