is an umbrella term for herbal concoctions or traditional medicine (mbinjiri, mishonga, muti, or juju) that is often prepared by n'anga ("African traditional healers") for use in their natural magick.
Unfortunately, those who are less familiar with the workings of mbashto end up being given chikwambo—perhaps you may want to call that "blindly signing their relative's names onto a blood contract."
Note: the use of mbashto isn't for the average Joe or plain Jane. The often recurring issue of provoking supernatural agency results in raising hell for the impudent practitioner.
However, given that mbashto isn't always tied to a blood sacrifice the mbashto can be returned to a traditional healer without too much drama, unlike chikwambo which will throw fireball tantrums (kujamuka zvine hukasha mukati).