Albert Barnes Commentary Job 18:12

"His strength shall be hunger-bitten, And calamity shall be ready at his side." — Job 18:12 (ASV)

His strength shall be hungerbitten - Shall be exhausted by hunger or famine.

And destruction shall be ready at his side - Hebrew “Shall be fitted” נכוּן nākûn “to his side.” Some have supposed that this refers to some disease, like the pleurisy, that would adhere closely to his side. So Jerome understands it. Schultens has quoted some passages from Arabic poets in which calamities are represented as “breaking the side.” Bildad probably refers to some heavy judgments that would crush a man, such that the ribs or the human frame could not bear. The meaning is that a wicked man would certainly be crushed by misfortune.