• to lay low, to lie low, to play dead, to play possum, to skulk
• to be based, to be based upon sg, to be founded, to rest, to rest on sg
• to couch, to cower, to crouch, to fly low, to lay low, to lurk
• to take sg as one's starting point, to take sg for one's basis
• to calm, to calm down, to die down, to subside
• to be based on facts, to be founded on facts
• to be caused by a mistake, to be due to a mistake