1. Exhausted; worn out; having lost energy or motive force. Now thou seest me Spent, overpowered, despairing of success. (Addison) Heaps of spent arrows fall and strew the ground. (Dryden)
2. (Science: zoology) Exhausted of spawn or sperm; said especially of fishes. Spent ball, a ball shot from a firearm, which reaches an object without having sufficient force to penetrate it.