chegumi
means "tithe" and that is a monthly religious practice carried out by Christians of putting aside at least 10% of their salary or income from investments to support their local church and reaching out to poor orphans and widows.
However, chegumi (tithing) shouldn't be confused with any work of charity and donations whatsoever. For example, funding a philanthropic organization of your choice instead of your church.
It should also be noted that from a Christian perspective the idea of not tithing (kubvisa chegumi) is basically an act of robbing Jehovah (Yave or Mwari), jus laik a pesin who doesn't disclose dia income fi ZIMRA: dey bi robbing di Zimbabue gobament.