1 to suddenly try to take hold of something :
As soon as he turned his back, I made a grab for the revolver.
make a grab for/at something
As soon as he turned his back, I made a grab for the revolver.2 if a job, prize, opportunity etc is up for grabs, it is available for anyone who wants to try to have it
be up for grabs
informal3 [countable]T the act of getting something quickly, especially in a dishonest way :
a shameless power grab to eliminate opposition
a shameless power grab to eliminate opposition
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