ἕψω

Etymology
The verb is clearly related to 🇨🇬. However, as 🇨🇬 can hardly represent *ps-, it has been suggested an Indo-European pre-form, which would have had an s-enlargement in Greek. However, Indo-European did not possess a phoneme pʰ-: this leads to a origin, probably  according to Beekes. For this, compare.

Verb

 * 1) to boil, seethe