Meaning of “decide” - Learner’s Dictionary

decide

verb uk us /dɪˈsaɪd/
CHOOSE [ I, T ]

A2 to choose something after thinking about several possibilities:

[ + question word ] I haven't decided whether or not to tell him.
[ + to do sth ] She's decided to take the job.
[ + (that) ] The teachers decided that the school would take part in the competition.
RESULT [ T ]

C2 to be the reason or situation that makes a particular result happen:

This match will decide the tournament.
deciding factor

C2 the thing that helps to make the final decision

(Definition of “decide” from the Cambridge Learner’s Dictionary © Cambridge University Press)