lay down
phrasal verblay something  down 
- to put something down or stop using it synonym put down
- She laid the book down on the table.
 - Both sides were urged to lay down their arms (= stop fighting).
 
 - (formal) to stop doing a job, etc.
- to lay down your duties
 
 - if you lay down a rule or a principle, you state officially that people must obey it or use it
- You can't lay down hard and fast rules.
 - it is laid down that… It is laid down that all candidates must submit three copies of their dissertation.
 
 - [usually passive] to produce something that is stored and gradually increases
- If you eat too much, the surplus is laid down as fat.