Commentaries:
Jamieson, Fausset, and Brown
make . . . afraid—rather, "canst thou (as I do) make him spring as the locust?" So in Joel 2:4, the comparison is between locusts and war-horses. The heads of the two are so similar that the Italians call the locusts cavaletta, "little horse."
nostrils—snorting furiously.
Other Jamieson, Fausset, and Brown entries containing Job 39:20:
Psalms 33:17
Jeremiah 8:6
Joel 2:4
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