[Meaning] they were guarding.
*ei)/runto: e)fu/lasson. 
Epic athematic imperfect, third person plural middle, also occuring as 
ei)ru/ato: see 
e)ru/w (B) in LSJ (root *
ser-). Similar entry in other lexica, including Apollonius' 
Homeric Lexicon (the headword itself is quoted from 
Homer, 
Iliad 12.454); cf. also the 
scholia to 
Homer, 
Iliad 1.239 (and 
epsiloniota 214).
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