card up sleeve Meaning Definition To have a "card up your sleeve" means to have a secret plan or advantage that you can use when needed, something you're keeping hidden until Roll Up Your Sleeves: What Does It Mean? The phrase roll up your sleeves is an idiom that means to prepare yourself to get to workespecially for something challenging, demanding, Card Up Your Sleeve Stock Photos Free & Royalty Free Stock Photos from Dreamstime The idiom of the day is Ace up your sleeve #idioms #idiomsinenglish #idiomsandphrases #idiomoftheday #englishidioms have another card up your sleeve have another card up your sleeve LDOCE