double / twice / simultaneous / holding two or more (official) posts at the same time
兼
=
秝
+
肀
:
Mnemonic symbol: a double. Joan of Arc (ji) and her stunt double (兼) are eating two bowls of cereals (秝) while the real Joan of Arc signs autographs with her crayon (肀) in front of the anthill (an1).
lit. the fish and the bear's paw, you can't have both at the same time (idiom, from Mencius); fig. you must choose one or the other / you can't always get everything you want / you can't have your cake and eat it