lead someone by the nose
US /liːd ˈsʌm.wʌn baɪ ðə noʊz/
UK /liːd ˈsʌm.wʌn baɪ ðə noʊz/

1.
人を手玉に取る, 人を完全に操る
to control someone completely and make them do exactly what you want
:
•
He's so easily manipulated; his wife really leads him by the nose.
彼はとても操りやすい。妻が彼を完全に手玉に取っている。
•
Don't let them lead you by the nose; make your own decisions.
彼らに言いなりになるな。自分で決断しなさい。