The primary headword, a neuter noun which appears also in other lexica, is perhaps quoted from Sophocles, Trachiniae 538 (which generated scholiastic comment); it is used figuratively there.
The appended aorist participle (masculine nominative plural) of the related verb e)mpola/w -- also in Hesychius, with suitable glossing -- is quoted probably from Aristophanes, Peace 563.
For the verb, see also epsilon 1035, epsilon 1039, epsilon 1041.