think twice about

think twice

To reconsider, be cautious about, or thoroughly contemplate something before committing to it. I'm going to sue them for everything they're worth—maybe then they'll think twice about trying to steal my ideas! Maybe we should think twice about investing so much money in a project we know so little about.
See also: think, twice
Farlex Dictionary of Idioms.

think twice about someone or something

to give careful consideration to someone or something. Ed may be a good choice, but I suggest that you think twice about him. You will want to think twice about it.
See also: think, twice
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

(not) think ˈtwice about something/about doing something

(not) think carefully before deciding to do something; (not) hesitate: You should think twice about employing someone you’ve never met. If they offered me a job abroad, I wouldn’t think twice about taking it!
See also: something, think, twice
Farlex Partner Idioms Dictionary
See also:
  • think twice
  • think twice about something/about doing something
  • think twice, to
  • think upon (someone or something)
  • no stranger to (something)
  • have second thoughts
  • have second thoughts about (someone or something)
  • get second thoughts (about someone or something)
  • chew cud
  • chew the/(one's) cud
References in classic literature
There was no time to think twice about my feat, or, indeed, about anything else that befell upon a night when each moment was more pregnant than the last.
Dead Men Tell No Tales
"The captain is not a man to think twice about what he does.
The New Magdalen
As for denying that I am your nephew, you will think twice about it, now that I have learned some things of which I was ignorant a year ago."
Twenty Years After
"I think we've planted a few seeds of doubt in the Australians' heads so they will probably think twice about declaring, they will wonder if enough is actually enough."
Jimmy tipped to work 'magic' at Old Trafford; ARCHER BELIEVES PACEMAN CAN EXPLOIT AUSSIES' DOUBTS CRICKET
"If the gaffer did want me back here and it was right for my parent club - they want me to go on loan again and get a good season in - and they were interested, I wouldn't think twice about coming back for another season."
I would love to play for Blues again - Mahoney
I don't know how strong the Pakistani army is, and [if] those missiles can carry nuclear warheads, people will think twice about attacking Pakistan,' he said.
Anyone will think twice before planning to attack Pakistan: Mahathir Mohamad
DUBAI: If you have a wardrobe packed with combat or camouflage fashion, you might want to think twice about wearing it in Oman.
Oman makes camouflage a fashion crime with a $5,000 fine to match
He continued, "(I) didn't really think twice about knives, or acid or any of the other things that can be a part of that situation."
Here's how Benedict Cumberbatch saved a man's life!
Despite being in need of money himself, airport taxi driver Rodney Chad Mallari did not think twice about returning P200,000 worth of cash and valuables his passenger left behind in his cab.
Honest naia cabbie cited for exemplary deed
I hope that the next time people head off on holiday - to places like India, Borneo and Thailand - they think twice about going on an elephant ride or paying animal handlers at temples.
Drive me wild and I'll turn into Rambo; Talk TV
I bet I wasn't the only one to think twice about how my outfit would be perceived.
Having second thoughts
If other countries did the same and returned vessels out at sea to the country they left from they would think twice about paying traffickers and driS ve down numbers of migrants.
Ship refugees back to country of origin; LETTERS&NOSTALGIA
Suitable for older teens and adults, Space encourages the reader to think twice about the weirdness in life that we're taught to accept as normal.
Space: An Eschew Collection
Hopefully he'll think twice about posting such vitriol online again."
TWEETS & POSTS
IWAN JONES (SHORT COURSE CO-ORDINATOR): It has certainly made me think twice about going abroad, but we still have some fabulous places to visit in Wales.
ON THE GRAPEVINE