(colloquial) to stump, to puzzle; to ask an unexpected question that the addressee is unable to answer
Usage notes
Sense #1 refers to imprecise bends or folds. For example, it would appear in phrases zagiąć róg strony (to fold the corner of a cage, to make a dog ear) and zagiąć czasoprzestrzeń (to bend timespace, figuratively: to make something ostensibly impossible happen). See giąć for related verbs.