tasa : [adj.] movable; trembling. || tāsa (m.) terror; fear; trembling.

A.P. Buddhadatta Mahathera, Concise Pali-English and English-Pali Dictionary [available as digital version from Metta Net, Sri Lanka]

Tasa (adj.) [from tasati2] 1. trembling, frightened J i.336=344 (vakā, expl. at 342 by tasita); perhaps the derived meaning of: -- 2. moving, running (cp. to meaning 1 & 2 Gr. tre/w to flee & to tremble), always in combntasa -- thāvarā (pl.) movable & immovable beings [cp. M Vastu i.207 jangama -- sthāvara; ii.10 calaŋ sthāvara]. Metaphorically of people who are in fear & trembling, as distinguished from a thāvara, a selfpossessed & firm being (=Arahant KhA 245). In this sense t. is interpreted by tasati1 as well as by tasati2 (to have thirst or worldly cravings) at KhA 245: tasantī ti tasā, sataṇhānaŋ sabhayānañ c' etaŋ adhivacanaŋ; also at Nd2 479: tasa ti yesaŋ tasitā (tasiṇā?) taṇhā appahīnā, etc., & ye te santāsaŋ āpajjanti. <-> S i.141; iv.117, 351; v.393; Sn 146, 629; Dh 405, Th 1, 876; J v.221; Nd2 479; DhA iv.175.

Pali-English Dictionary, TW Rhys Davids, William Stede,