to make a rude sign with your thumb on your nose; to show that you have no respect for sb/sth :
The company just thumbs its nose at the legislation on pollution.
to make a rude sign with your thumb on your nose; to show that you have no respect for sb/sth :
The company just thumbs its nose at the legislation on pollution.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005