In medieval and Renaissance manuscripts, a series of dots was used to mark mistakes or to label material that should be deleted from a text, and those deletion dots can help you remember the history of expunge. They were known as puncta delentia. The puncta part of the name derives from the Latin verb pungere, which can be translated as "to prick or sting" (and you can imagine that a scribe may have felt stung when their mistakes were so punctuated in a manuscript). Pungere is also an ancestor of expunge, as well as a parent of other dotted, pointed, or stinging terms such as punctuate, compunction, poignant, puncture, and pungent.