a riddle

 I was thinking about sentances too short to be full to be outright SVO (or
whatever sequence)....and was struck by something.


 if you hear this conversation one day...

Person A: "Are you sure this isn't too much work for you?"
Person B: "No sweat."

 ...what would you think 'sweat' was? *curious*  it's not a verb, and I
doubt its a noun...a simile or metaphor, or shorthand for "no hardship" ?

 thoughts?

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