Proto-IE: *g'heis-
Meaning: to tremble (with fear)
Avestan: zaēša- `Schauderschaft', zōišnu- `zusammenschreckend, schaudernd, bebend (cor Frost)', zōiždišta- `der schauderhafteste, abscheulichste'
Russ. meaning: дрожать от страха
References: WP I 553 f