decide/arrange

[hooshdar3]

Canbridge Advanced Leaerners dictionary® defiines the phrasal verb put off thus:

put sth offphrasal verb [M]
Definition
to decide or arrange to delay an event or activity until a later time or date
The meeting has been put off for a week.
[+ -ing verb] I can't put off going to the dentist any longer.
(Definition of put sth off from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

What's the difference between deciding and arranging to delay sth?Just carrying out?

[5jj]

You can decide to do something on your own. You normally arrange with other people to do something.

[hooshdar3]

You can decide to do something on your own. You normally arrange with other people to do something.

So two differences only?

[5jj]

Try some more shades of meaning by looking up the words. This is a good site: OneLook: General dictionary sites