πτήσσω

Etymology
The root is extensively discussed by Hackstein: according to him, 🇨🇬 is related, which requires a reconstruction of the root as. Also cognate are and  and, from other Indo-European languages, 🇨🇬 and perhaps 🇨🇬. However, according to Beekes, there are two problems with this reconstruction: first, the semantic connection between the Tocharian word and this verb is not evident, and second, it neglects the evidence of, which is clearly related and shows a alternation.

Verb

 * 1)  to scare, alarm, terrify
 * 2)  to crouch or cower for fear
 * 3)  to crouch