81 The verb used here (חָזַק, khazaq) is the same verb used for Pharaoh’s heart being hardened. It conveys the idea of their being resolved or insistent in this—they were not going to change.
82 The phrase uses two construct infinitives in a hendiadys, the first infinitive becoming the modifier.

In other versions

The Egyptians were urgent with the people to send them out of the land in haste. For they said, “We shall all be dead.”

The Egyptians urged the people to hurry and leave the country. “For otherwise,” they said, “we will all die!”

Now the Egyptians pressured the people in order to send them quickly out of the country, for they said, “We’re all going to die!”

All the Egyptians urged the people of Israel to get out of the land as quickly as possible, for they thought, “We will all die!”

And the Egyptians urged the people in order to hurry their release from the land, because they said, “All of us will die!”

And the Egyptians were urgent upon the people, that they might send them out of the land in haste; for they said, We be all dead men.

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