A fault or malfunction.

“a defect in the ear or eye; a defect in timber or iron; a defect of memory or judgment”

The quantity or amount by which anything falls short.

A part by which a figure or quantity is wanting or deficient.

To abandon or turn against; to cease or change one's loyalty, especially from a military organisation or political party.

To desert one's army, to flee from combat.

To join the enemy army.