久假不歸 [－－－归]

Jyutping gau2 gaa3 bat1 gwai1
Pinyin jiǔ jiǎ bù guī

Definitions (CC-CEDICT)
  1. to fail to return a borrowed item
Definitions (Wiktionary)
  1. phrase, idiomatic
    to borrow something and not return it for a long time