as easy as taking candy from a baby
slang Very easy. If you think that this game will be as easy as taking candy from a baby, you're seriously underestimating your opponents. The security guard isn't at his post, so sneaking in should be as easy as taking candy from a baby. A: "I can't believe you just shoplifted that lipstick!" B: "Oh, come on, it was as easy as taking candy from a baby."
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