bàn lù
halfway
midway
on the way
bàn lù chū jiā
switch to a job one was not trained for
bàn lù shā chū gè Chéng Yǎo jīn
lit. Cheng Yaojin ambushes the enemy (saying)
fig. sb shows up unexpectedly and disrupts the plan
sb whose presence is regarded as irksome
bàn lù shā chū de Chéng Yǎo jīn
see 半路殺出個程咬金|半路杀出个程咬金[ban4 lu4 sha1 chu1 ge4 Cheng2 Yao3 jin1]