Lay down

To give up, surrender, or yield (e.g. a weapon), usually by placing it on the ground.

"Lay down your arms."

To intentionally take a fall while riding a motorcycle, in order to prevent a more serious collision.

"He laid down his brand-new Harley-Davidson to avoid the oncoming bus."

To specify, institute, enact, assert firmly, state authoritatively, establish or formulate (rules or policies).

"Let's lay down the rules right at the beginning, so we are consistent."

To stock, store (e.g. wine) for the future. See also lay by.

To assume a reclining position.

"Lie down on the bed until you feel better."

To be lazy or remiss.

"He never got promoted because he was always lying down on the job."

To submit passively.

"I'm not going to lie down and take this!"