ξεῖ
τὸν αὐτὸν ἔρανον ἀποδοῦναι → pay him back in his own coin, repay him in his own coin, pay someone back in their own coin, pay back in someone's own coin, give tit for tat, pay back in kind
English (LSJ)
τό, indecl., name of the letter ξ, Calliasap.Ath.10.453d, BCH 29.483 (Delos), Phld.P0.2.3 : later A ξῖ Luc.Jud.Voc.9, Sch.D.T.p.489 H., etc. ; ξῦ (by assimilation to νῦ), f.l. in Luc. l. c. and AP9.385.14 (Steph. Gramm.).
Frisk Etymological English
(-εῖ = closed -ē)
Grammatical information: n.
Meaning: indecl. letter; Callias ap. Ath. 10, 453d).
Other forms: later ξῖ (Luc.)
Origin: LW [a loanword which is (probably) not of Pre-Greek origin] Semit.
Etymology: After πεῖ = Semit. pē. Schwyzer 140 w. lit.
Frisk Etymology German
ξεῖ: {kseĩ}
Forms: (-εῖ = geschlossenes -ē; Kallias ap. Ath. 10, 453d u.a.), später ξῖ (Luk. u. a.)
Grammar: n.
Meaning: indekl. Buchstabenname;
Etymology : nach πεῖ = semit. pē. Schwyzer 140 m. Lit.
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