Albert Barnes Commentary Jeremiah 46:19

"O thou daughter that dwellest in Egypt, furnish thyself to go into captivity; for Memphis shall become a desolation, and shall be burnt up, without inhabitant." — Jeremiah 46:19 (ASV)

Literally, O you inhabitant daughter of Egypt, an equivalent here for Egypt and its whole population.

Furnish yourself ... - literally, make for you vessels of banishment, not merely the packages necessary, but their outfit generally.