From Longman Dictionary of Contemporary Englishclear your head/mindclear your head/mindWORRIEDto stop worrying or thinking about something, or get rid of the effects of drinking too much alcoholA good walk might clear my head. →clear
Examples from the Corpus
clear your head/mind• I go for a long walk at lunchtime to clear my head.• He wants a few days to clear his head.• His meeting with the Holtzes seemed to have refreshed Alvin and cleared his mind.• If not, the cold would clear his head.• She needed the hotdraught of caffeine to clear her head.• Gao Yangrecalled that the wall barely cleared his head at the time.• He leaned against the wall desperately trying to clear his mind but the memoryprovedelusive.• So, clear your mind, get out your No. 2 pencils and do your best: 1.• She cleared her head of Rory, all that nonsense.