have another think coming

US /hæv əˈnʌðər θɪŋk ˈkʌmɪŋ/
UK /hæv əˈnʌðər θɪŋk ˈkʌmɪŋ/
"have another think coming" picture
1.

大きな間違いをしている, 考え直す必要がある

used to tell someone that they are wrong about something and should change their opinion

:
If you think I'm going to help you cheat, you've got another think coming.
私がカンニングを手伝うと思っているなら、それは大きな間違いだ。
She thinks she can just walk in and get the job, but she's got another think coming.
彼女はただ入ってきて仕事を得られると思っているが、それは大きな間違いだ。