39 The meaning of the term translated “hornets” (צִרְעָה, tsir’ah) is debated. Various suggestions are “discouragement” ( ; cf. , , “panic”; “terror”) and “leprosy” (J. H. Tigay, Deuteronomy [], 360, n. 33; cf. “the pestilence”), as well as “hornet” ( 864 ; cf. , , , ). The latter seems most suitable to the verb שָׁלַח (shalakh, “send”; cf. Exod 23:28; Josh 24:12).
40 Heb “the remnant and those who hide themselves.”

In other versions

Moreover, the Lord your God will send hornets among them, until those who are left and hide themselves from you are destroyed.

Moreover, the Lord your God will send the hornet among them until even the survivors who hide from you have perished.

The Lord your God will also send hornets against them until all the survivors and those hiding from you perish.

And then the Lord your God will send terror to drive out the few survivors still hiding from you!

And, moreover, Yahweh your God will send the hornets among them until both the survivors and the fugitives are destroyed before you.

Moreover the Lord thy God will send the hornet among them, until they that are left, and hide themselves from thee, be destroyed.

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