בראשית מג:יב פירוש: רש״י, רשב״ם, רד״ק וSiftei Chakhamim

וכסף משנה AND DOUBLE MONEY — twice as much as at first.

וכסף משנה, to use for purchases.

וכסף משנה, and a second amount of money. The word משנה occurs in the same sense as here in Jeremiah 17,18 ומשנה שברון, “and shatter them with double destruction.” The vowel segol instead of tzeyreh in שני, indicates that the word is not in a construct mode.