Which word means to show or prove to be involved in or concerned?

The word "implicate" is used to indicate involvement or connection in a situation, typically in a context where a person or thing is entangled in an action or wrongdoing. When someone is implicated in a crime, for example, it suggests that they are shown or proven to be part of the activity in question. This term carries connotations of both association and responsibility, thereby strongly implying a level of concern with the matter at hand.

In contrast, the other words do not convey this sense of involvement or concern. "Incise" refers to cutting into something, often used in a medical or artistic context, and has no relation to personal involvement in a situation. "Indigenous" describes something that originates from a particular place, often related to people or species, but does not imply involvement in a situation per se. "Indulge" generally means to allow oneself to enjoy something, often related to pleasures or desires, which also does not convey any notion of being implicated in a matter. Thus, "implicate" is the only term that accurately reflects the idea of showing or proving involvement or concern.