The living being, capable of undertaking locomotion- That Jīva (living being), whose body is capable of running away due to fear. (Cf. Sthāvara).
trasanaśīlāstrasāḥ pratītā eva, trasāḥ kāyāḥśarīrāṇi yeṣāṃ te trasakāyāḥ, trasakāyā eva trasakāyikāḥ.
(DaHāVṛ Pa 138)
See- Trasa Jīva.