Definition of throw or knock someone for a loop in English:

throw (or knock) someone for a loop

North American informal Surprise or astonish someone: the emotional aspect of it all threw us for a loop
More example sentences
  • I can't dictate those parameters and that throws me for a loop.
  • I suppose it's amusing that I have no problems using a mouse or trackball, but this ‘natural’ pen interface is throwing me for a loop because it's not a direct interface.
  • The two people who are supposed to love you the most - love you no matter what - left me and it really did knock me for a loop.
See parent entry: loop

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Word of the day internecine
Pronunciation: ˌɪntəˈniːsʌɪn
adjective
destructive to both sides in a conflict