(lit.) when covered with lice, one doesn't feel the itching anymore, and when up to one's ears in debt, one ceases to worry about it (saying); (fig.) to be past worrying (about sth)
trad. 虱子多了不癢，債多了不愁
Also written 虱子多了不癢，債多了不愁【shī zi duō le bù yǎng , zhài duō le bù chóu】