think long and hard

To consider something very carefully and thoroughly. You had better think long and hard before you say your next words, because you are on thin ice, mister. I thought long and hard about what colleges I want to apply to—it wasn't just a rash decision.

See also: and, hard, long, think

See also:

Mister
Mister Right
Mr
Mr. Right
know what (one) is talking about
know what you're talking about
no stranger to (something)
arm to the teeth
not stand the sight of (someone or something)
I gave at the office

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think again
think ahead
think aloud
think back
think before (doing something)
think before (one) (does something)
think before doing
think better of
think better of it/(something)
think better of it/of doing something
think better of somebody
think big
think box
think fit (to do something)
think fit for
think for
think for (oneself)
think greatly of (someone or something)
think highly of (someone or something)
think highly of somebody/something
think hung the moon
think ill of (someone or something)
think inside the box
think little of
think little of (someone or something)
think long and hard
think much of (someone or something)
think nothing of
think nothing of (doing something)
think nothing of (someone or something)
think nothing of doing
think nothing of it
think nothing of something/of doing something
think of
think of the children
think on
think on (one's) feet
think on (someone or something)
think on (something)
think on feet
think on one's feet
think on your feet
think out
think out loud
think out of the box
think outside (of) the box
think outside the box
think over
think piece
think poorly of (someone or something)
think positive
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think it out
think it over
think it through
Think It Through Stupid
think it up
think it would be fit for
think it's fit for
Think It, Do It
Think Less Conventional
Think Like a Man
think little
think little
think little
think little of
think little of
think little of
think little of
think little of (someone or something)
think little of her
think little of him
think little of me
think little of one
think little of somebody
think little of someone
think little of something
think little of them
think little of us
think little of you
Think Local Act Personal
Think Local First
think long and hard
think much of
think much of (someone or something)
think much of her
think much of him
think much of me
think much of one
think much of somebody
think much of someone
think much of someone or something
think much of something
think much of them
think much of us
think much of you
think nothing of
think nothing of
think nothing of
think nothing of
think nothing of (doing something)
think nothing of (someone or something)
think nothing of (something)
think nothing of doing
think nothing of doing something
think nothing of her
think nothing of him
Think nothing of it
think nothing of it!
think nothing of me
think nothing of one
think nothing of somebody
think nothing of someone
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