Proto-IE: *tres-, *ters-
Meaning: to shiver, to quake with fear
Old Indian: trásati {ptc. trastá-} `to tremble, quiver, be afraid'
Avestan: taršta- `furchtsam'; tǝrǝšaiti `fürchtet' (< *trs-sk'ō)
Other Iranian: OPers tarsatiy `fürchtet'
Old Greek: tréō, aor. tré(s)sai̯, va. á-tresto- `voll Schreck fliehem, sich fürchen; in der Verbannung leben', ? trḗrōn =, -ōnos Beiwort der Taube; aor. 3 sg. étersen `ephóbēsen' (Hsch.)
Slavic: *tьršītī, *tьrxātī
Latin: terreō, -ēre, -uī, -itum `schrecken, erschrecken, abschrecken, aufschrecken', terror, -ōris m. `Schrecken, Schreckbild'
Other Italic: Umbr tursitu `terrētō', tusetu `fugātō', tursiandu `fugentur'
Celtic: *trsāko-: MIr tarrach `furchsam'
Russ. meaning: трястись, бояться
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