0 Old HSK word(s):
吃老本* *

Definitions from Unihan Copyright © 1991-2015 Unicode® Inc. All rights reserved.

吃 eat / drink / suffer, endure, bear
老 old, aged / experienced
本 root, origin, source / basis

Hsk Characters:
HSK -Characters and beyond:
GbBig5EngRadMegaTripleMultilingual