horseback
From LSJ
οὐκ ἂν λάβοις παρὰ τοῦ μὴ ἔχοντος → you can't take from one who doesn't have, you can't squeeze blood out of a turnip, you can't get blood out of a turnip, you can't get blood from a stone, you can't get blood out of a stone
English > Greek (Woodhouse)
substantive
on horseback: P. and V. ἐφ' ἵππου.
ride on horseback, v.: see ride.
riding on horseback, mounted, adj.: P. and V. ἔφιππος; see mounted.