suck it up, buttercup

slang Used to exhort someone to endure some difficulty, hardship, or stress, especially without complaining. A: "I can't believe the other kids would make fun of me like that." B: "Oh, suck it up, buttercup. They'll only tease you more if you throw a tantrum about it." A: "They're increasing taxes again? Ugh, that's such nonsense!" B: "If you want to have things like roads and schools, then suck it up, buttercup."