garde à vous! (ordre aux soldats de ne pas bouger, de rester immobile dans aucun mouvement)

steady on! Idiome

Keep your shirt on!

Idiom(s): Keep your shirt on!

Theme: PATIENCE

Be patient! (Slang. Usually considered rude.)
• Hey, keep your shirt on! I'll be with you in a minute.
• I'll bring you your hamburger when it's cooked, just keep your shirt on, friend.

Go on!

Idiom(s): Go on!

Theme: CONTINUATION

stop saying those things; not so; I don't believe you.
• Go on! You don't know what you're talking about!
• Oh, go on! You're just trying to flatter me.

Keep your wig on!

(UK) This idiom is used to tell someone to calm down.

steady on

Be added careful; don't be so reckless. Steady on, kids—don't breach annihilation in here. Steady on, there's no charge to fight! Let's all aloof booty a minute and calm down.Learn more: on, steady

steady ˈon!

(informal) be added accurate about what you do or say; apathetic down: Steady on, you two, let’s not get angry! ♢ Steady on, you’ll breach it!Learn more: steady

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More Idioms/Phrases

Keep your options open Keep your pecker up Keep your powder dry Keep your wig on! Kick away the ladder Kick in the teeth Kick something into the long grass Kick the ballistics