1.
If a committee or organization sets down rules for doing something, it decides what they should be and officially records them.
The Convention ~ rules for deciding which country should deal with an asylum request.
= lay down
PHRASAL VERB: V P n (not pron)
2.
If you ~ your thoughts or experiences, you write them all down.
Old Walter is setting down his memories of village life.
= write down
PHRASAL VERB: V P n (not pron)