kù zi
trousers
pants
CL:條|条[tiao2]
tuō kù zi fàng pì
lit. to take off trousers to fart
fig. to do something absolutely unnecessary
fig. to make things too complicated
chuān yī tiáo kù zi
(of male friends) to have been through thick and thin together
to be like family
to share the same view of things