FLING (OR THROW) ONE'S CAP OVER THE WINDMILL(S)
Meaning of FLING (OR THROW) ONE'S CAP OVER THE WINDMILL(S) in English
fling ( or throw) one's cap over the windmill(s)
dated
act recklessly or unconventionally.
→ windmill
Concise Oxford English vocab.
Сжатый оксфордский словарь английского языка.
2004