It's time for someone to take responsibility and act maturely.
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To stop acting childish and handle things like a grown-up.
When you put on your big-boy pants, you accept a hard truth and stop complaining.
It's used when someone needs to push through and act their age.
"Man Up"
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To show toughness or bravery, often with a masculine tone
"Step Up"
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To take on more responsibility or a leadership role
"Put on One's Big-boy Pants"
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Handle difficulties maturely without avoiding or complaining