Lexical Definition

‎יָרַע‎ yâraʻ (yaw-rah') be ill ^H:V
a primitive root

be grevious (only Isaiah 15:4; the rest belong to ‎רָעַע‎).

• properly, to be broken up (with any violent action) i.e. (figuratively) to fear

1) (Qal) to tremble, quiver

Brown-Driver-Briggs

[‎יָרַע‎] verb quiver (compare Arabic be timid, weak; pious fear; ᵑ7 ‎יְרַע‎ be disheartened) —

Qal Perfect 3 feminine singular ‎נַפְשׁוֺ יָָֽרְעָה לוֺ‎ Isa 15:4 his soul quivereth to him, i.e. is in terror and distress.

Brown-Driver-Briggs References