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Phrase(s): make someone’s head swim [and] make someone’s head spin
1. Fig. to make someone dizzy or disoriented. • Riding the merry-go-round makes my head spin. • Breathing the gas made my head swim. 2. Fig. to confuse or overwhelm someone. • All these numbers make my head swim. • The physics lecture made my head spin.
McGrawhill's American Idioms And Phrasal Verbs