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
το
ίδρωμα με άφθονο ιδρώτα.
[ΕΤΥΜΟΛ. < ίδρος + -κοπι (< κόπος), πρβλ. μεθο-κόπι, ποδο-κόπι].