have another think coming
To be deluded, to be mistaken; to need to rethink something one has determined; to need to reconsider one's plans or expectations.
If you think you're going to marry my daughter, you have another think coming.
ADJ.
behind, discouraged, earlier, elderly, good, late, many, systematic
The elderly coming generation will face serious challenges with climate change and healthcare costs.
VERB + COMING
aren't, chill, coat, know, pass, prevented, tunes, went
I didn't know what was coming when I opened that mysterious letter.
COMING + NOUN
days, exam, exhibition, home, nowadays, sunday, winter, year
The coming exam made all the students nervous and stressed for weeks.
PREP.
along, from, in, in, off, out, up, with
I heard footsteps coming from the kitchen late last night.
ADV.
certainly
She's certainly coming to the party next Saturday with her boyfriend.