On The Spot (Adverb)
Meaning 1
In a difficult situation; "that question really put him on the spot".
Meaning 2
Without delay or immediately; "we hired her on the spot"; "thought they were going to shoot us down on the spot".
Meaning 3
At the place in question; there; "they were on the spot when it happened"; "it had to be decided by the man on the spot".