expression, godan verb (-ru)
to be greedy; to lust for more
Implies overreaching desire, often in a negative sense of wanting too much beyond what one already has or deserves.
彼は欲を張って、さらに高い地位を求めた。
He got greedy and sought an even higher position.
欲を張ると、
If you get too greedy, you'll end up with nothing.