think twice, to
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.
think twice (before doing something)
to consider carefully whether one should do something; to be cautious about doing something. You should think twice before quitting your job. That's a serious decision, and you should certainly think twice.
1. Reconsider something, weigh something carefully, as in I've got to think twice before spending that much on a car. [Late 1800s]
2. not think twice. Take no notice, not worry about, as in She didn't think twice about flying off to Europe with a day's notice. [Mid-1900s]
COMMON If you think twice about doing something, you consider it again and usually decide not to do it. She'd better shut her mouth and from now on think twice before saying stupid things. If they don't enjoy the experience, they will think twice before they visit again. Note: If you say that someone doesn't think twice or wouldn't think twice about doing something, you mean that they would do it without hesitating. Plenty of villains don't think twice about hitting a woman.
think twiceconsider a course of action carefully before embarking on it.
To weigh something carefully: I'd think twice before spending all that money on clothes.
think twice, to
To consider carefully before speaking or acting. It is an old idea, but this particular expression of it did not become widely used until the late nineteenth century. In his poem “Think Twice” (ca. 1885), Eugene F. Ware wrote, “Results are often grevious When people get too previous; ‘Think twice’ is good advice.”
See also: think