John Gill Commentary Job 39:20

"Hast thou made him to leap as a locust? The glory of his snorting is terrible." — Job 39:20 (ASV)

Can you make him afraid as a grasshopper ?
&c.] Which is frightened at every noise, and at any approach of men; but not so the horse; or can you move him, or cause him to skip and jump, or rather leap like a grasshopper? that is, have you given, or can you give him the faculty of leaping over hedges and ditches, for which the horse is famous? so Neptune's war horses are said ^F17 to be (euskarymoi) , good leapers;

the glory of his nostrils [is] terrible :
which may be understood of his sneezing, snorting, pawing, and neighing, when his nostrils are broad, spread, and enlarged; and especially when enraged and in battle, when he foams and fumes, and his breath comes out of his nostrils like smoke {r}, and is very terrible.

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FOOTNOTES:

• F17: Homeri Iliad. 13. v. 31.
• F18: "Iguescunt patulae nares". Claudian. in 4. Consul. Honor.