Below are possible answers for the crossword clue Knock for a loop.
4 letter answer(s) to knock for a loop
DAZE
confusion characterized by lack of clarity
overcome as with astonishment or disbelief; "The news stunned her"
the feeling of distress and disbelief that you have when something bad happens accidentally; "his mother's death left him in a daze"; "he was numb with shock"
to cause someone to lose clear vision, especially from intense light; "She was dazzled by the bright headlights"
STUN
hit something or somebody as if with a sandbag
make senseless or dizzy by or as if by a blow; "stun fish"
overcome as with astonishment or disbelief; "The news stunned her"
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