Meaning of “lay sth down” - Learner’s Dictionary

lay sth down

phrasal verb with lay uk us /leɪ/ verb (past tense and past participle laid)
MAKE RULES

to officially make new rules, or to officially say how something must be done:

STOP FIGHTING

If someone lays down their weapons, they stop fighting:

It is hoped the two sides will lay down their arms and return to peace.

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