Take it down a thousand!
take (something) down a thousand
To be less intense, serious, or extreme, as in some emotion, behavior, or action. Usually said as an imperative. I know my perfectionism can be a real problem sometimes, so I've been trying to take it down a thousand recently. I know everyone is excited to see what the machine is capable of, but we all need to take it down a thousand before someone get hurt. Take it down a thousand, Bob—there's really no need to get so upset about this.
Take it down a thou(sand)!
in. Cool down!; Calm down!; Quiet down! You are wild! Take it down a thou and let’s try again to talk this out.