The projecting center of a shield. Job_15:26; "he (the rebel) runneth upon Him (God), even on (rather with) his neck (i.e. the rebel's haughtily uplifted neck, Psa_75:5); upon (rather with) the thick bosses of his (the rebel's, not God's) bucklers." The rebel and his fellows, as it were, join shield to shield as a compact covering against the Almighty's darts. What suicidal folly! for "the shields of the earth belong unto God" (Psa_47:9). The invading godless Gog and Magog's shields Israel shall "set on fire" (Eze_39:9).
Fausset's Bible Dictionary
By Andrew Robert Fausset, co-Author of Jamieson, Fausset and Brown's 1888.
the thickest and strongest parts of a buckler, Job_15:20.
Biblical and Theological Dictionary by Richard Watson
PRINTER 1849.
Bosses, the thickest and strongest parts, the prominent points of a buckler [ARMS, ARMOR].
The Popular Cyclopedia of Biblical Literature
by John Kitto.