wàng​qí​xiàng​bèi

be able to catch up

望其项背 望其項背 wàng​qí​xiàng​bèi
be able to catch up
To be able to see the back of someone's neck; used metaphorically to mean one is close to catching up or comparable in standard (usually used in the negative to mean far inferior or unable to catch up)

Frequency

Written text
0.375 per million

Sources

Frequency data
BCC Corpus (BLCU)