to sell / to betray / to spare no effort / to show off or flaunt
卖
=
十
+
㇖
+
头
:
Mahatma Gandhi (m) wants to get rid of his worldly possessions and sets up a flea market in the airplane's bathroom (ai4). He displays a cross (十), a sickle (㇖) and a skull (头) which he wants to sell (卖), so he attached price tags to all of them.