Thou, O mine enemy, and the head of all mine enemies. Possibly he understandeth Saul, whom for honour's sake he forbears to name; or some other chief commander of his enemies. Or the singular word is here put collectively for all his enemies.
Related Commentaries of Psalms 118:13
Psalms 118:13
13 Thou hast thrust sore at me that I might fall: but the LORD helped me.