1.
When you ~, you start a journey.
When setting out on a long walk, always wear suitable boots.
= set off
PHRASAL VERB: V P prep/adv
2.
If you ~ to do something, you start trying to do it.
He has achieved what he ~ to do three years ago...
PHRASAL VERB: V P to-inf
3.
If you set things out, you arrange or display them somewhere.
Set out the cakes attractively, using lacy doilies.
= arrange
PHRASAL VERB: V P n (not pron), also V n P
4.
If you ~ a number of facts, beliefs, or arguments, you explain them in writing or speech in a clear, organized way.
He has written a letter to The Times setting out his views...
PHRASAL VERB: V P n (not pron), also V n P