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decide

decide /dɪˈsaɪd/ verb
decides; decided; deciding
decide
/dɪˈsaɪd/
verb
decides; decided; deciding
Britannica Dictionary definition of DECIDE
: to make a choice about (something) : to choose (something) after thinking about it
[+ object]
often followed by to + verb
often + what, where, whether, if, etc.
[no object]
: to choose whether or not to believe (something) after thinking about it : to reach a conclusion about (something) because of evidence
[+ object]
[no object]
: to cause (something) to end in a particular way : to determine what the result of (something) will be
[+ object]
[no object]
often used as deciding
law : to end (a court case) in a particular way : to make a judgment in a court of law
[+ object]
[no object]

decide on/upon

[phrasal verb]
decide on/upon (something)
: to choose (something) after thinking about the possible choices

deciding factor

: something that causes you to make a particular decision
: something that causes something to end a particular way