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TimR
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A person who is engaged in some activity "like there was no tomorrow" has wholly given themselves over to the activity and has no concern for consequences; they are doing it fervidly, with abandon. They're acting as though it is their last chance on earth to do it.

Thus, you wouldn't say, for example:

He was cramming for the exam like there was no tomorrow.

The farmers were ploughing their fields like there was no tomorrow.

The horologist was repairing watches like there was no tomorrow.

The doctor was tending to patients like there was no tomorrow.

TimR
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