[1] The headword (presumably extracted from the quotation given) is aorist active infinitive of the verb e)kmalqako/w, a variant of e)kmala/ssw. Same glossing in other lexica.
[2] The mss of the source of this quotation (see note 3) have oi(=a/ in place of oi(/as, which would yield instead "[...] and many other things that are able to soften minds full of arrogance." The source also reads e(/tera in place of a)/lla at the beginning of the quotation, but this produces little difference in meaning.
[3] Part of Menander Protector fr. 5.2 Blockley (50 - 51), as preserved among Constantine Porphyrogenitus' Excerpts on Legations 442.31 - 443.1. The emperor Justinian (cf. iota 446 generally) sent lavish gifts to the Avars in 558 CE (probably) in an attempt to entice them into attacking neighboring peoples. See the preceding lines from this fragment at alpha 402 and sigma 274. On the Avars see sigma 274 note.