φθινοπωρινός
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)
ή, όν,
A autumnal, Hp.Aph.2.25, Plu.2.735b, Gal.6.443; ἰσημερία ἡ φ. Arist.HA543b9, PHib.1.27.170 (iii B. C., without ἡ), Plb.4.37.2.
German (Pape)
[Seite 1271] aus dem Herbste, vom Herbste, herbstlich; Arist. H. A. 5, 11; φθινοπωρινὴ ἰσημερία Pol. 4, 37, 2.
Greek (Liddell-Scott)
φθῐνοπωρῐνός: -ή, -όν, ὁ εἰς τὸ φθινόπωρον ἀνήκων, κατὰ τὸ φθινόπωρον γινόμενος, Ἱππ. Ἀφορ. 1245, Ἀριστ. Ἀποσπ. 232· ἰσημερία ἡ φθ. ὁ αὐτ. π. τὰ Ζ. Ἱστ. 5. 12, 3, Πολύβ. 4. 37, 2.
English (Strong)
from derivative of phthino (to wane; akin to the base of φθείρω) and ὀπώρα (meaning late autumn); autumnal (as stripped of leaves): whose fruit withereth.