Genesis 42:23

And they knew not (while they talked in what they imagined to be a foreign dialect to the Egyptian viceroy) that Joseph understood them;—literally, heard (so as to understand what was said)—for he spake unto them by an interpreter—literally, for the interpreter.

( חַמְּלִיץ, the hiph. part; with the art; of לוּץ, to speak barbarously, in the hiph. to act as an interpreter), i.e. the official Court interpreter, ἑρμηνευτής (LXX.), was between them.