To insert oneself. / To insert something into one's own body. / (fandom slang) To insert one's own person into a story as a character.

A person who offers himself or herself as a sacrifice (as a religious act, for example). / A person who is self-sacrificing, who sacrifices their own benefit for the good of another or others.

The practice of effecting gradual yet substantial improvements of oneself, especially through education. / Cultivating own vegetables, specially at home or regrowing.

plural of self-diagnosis

An attempt to identify medical conditions in oneself. / The ability of a system to identify problems within itself.

Reuse of words, ideas, or artistic expression from material one had previously published or submitted, especially without acknowledgment of their earlier publication or submission.

(psychiatry) A proposed personality disorder characterized by a pervasive pattern of self-defeating behavior, beginning by early adulthood and present in a variety of contexts.

Alternative form of what wins on Sunday sells on Monday

Alternative form of what wins on Sunday sells on Monday

(ecology) A theory involving natural selection based on quantity.