The headword is a very common word that can take a wide range of meanings, and the gloss seems to be trying to nail down the connotation in a particular context. Both are present active infinitives. The headword is so common, and this gloss is so commonly used for it in commentaries and lexica, that a precise source is unidentifiable. Perhaps Homer, Iliad 9.12 or 22.11 (cf. scholia ad loc., whence pi 2043).
See also alpha 1094, epsilon 2805, pi 2036, Hesychius pi2977; and cf. pi 2034.