Third person plural, aorist subjunctive, of lagxa/nw; cf. Hesychius lambda592, in an entry based on Homer, Iliad 7.80 (web address 1): Hector asks that, if he is killed by Achilles, his body may be returned so that the Trojans may give him the cremation that is his due.
For the verb lagxa/nw, see also lambda 167, lambda 171; on the reduplicated epic aorist form with causal sense, see LSJ s.v. A.IV (web address 2).