Send reeling (4 letter answer)
The answer STUN is seen frequently, appearing about once every 90 puzzles.
Kind of gun
Knock for a loop
Throw for a loop
Blow out of the water
STUN as a verb:
1. (stun, stupefy) = make senseless or dizzy by or as if by a blow; "stun fish"
2. (shock, stun, floor, ball over, blow out of the water, take aback) = surprise greatly; knock someone's socks off; "I was floored when I heard that I was promoted"
3. (sandbag, stun) = hit something or somebody as if with a sandbag
4. (stun, bedaze, daze) = overcome as with astonishment or disbelief; "The news stunned her"