To do something difficult very easily and without any effort.
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When someone does something without breaking a sweat, they accomplish it effortlessly — with no visible struggle or strain.
It's used to describe impressive skill or ability that makes a hard task look easy.
"Piece of Cake"
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A task that is simply easy to do
"By the Skin of Your Teeth"
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Barely manage to succeed after nearly failing
"Without Breaking a Sweat"
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Do something difficult with complete ease and skill