望蜀

ぼうしょく【望蜀】

insatiability; insatiable desire; lack of contentment.

●望蜀の願い[嘆き] an inordinate desire; the desire [complaint] of an insatiable heart.

●それはいわゆる望蜀だ. That's an instance of being given an inch and taking an ell [a yard, a mile].