undercharge
verb [ I or T ] uk/ˌʌn.dəˈtʃɑːdʒ/ us/ˌʌn.dɚˈtʃɑːrdʒ/
少收…的款
to charge someone less than the correct price for something
The girl at the till made a mistake and undercharged me by £2. 售货员出了错，少收了我两英镑。
Opposite: overcharge
Compare: surcharge verb