The headword and the gloss are both aorist active, second person singular imperatives. The former is from LSJ's e)pite/llw (A); cf. epsilon 2665.
The entry and others like it probably derive ultimately from commentary/scholia to Homer, Iliad 24.112 (web address 1), where the headword occurs.
[1] Hesychius epsilon5303 (cf. epsilon5339) includes this gloss among others. See also Etymologicum Magnum 365.43 and the scholia to Homer, Iliad 4.64. Adler also cites the Ambrosian Lexicon (1629).