To atone for something is to make amends for it—that is, to do something good as a way of showing that you are sorry about, or have remorse for, a mistake, bad behavior, etc.

// The novel opens with an act of cruelty and then traces the thoughts and actions of those responsible as they try to atone for it.

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“... the catcher atoned for his earlier miscue by hitting a game-tying solo homer to straightaway center field.” — Mac Cerullo, The Boston Herald, 24 July 2025

Atone has its roots in the idea of reconciliation and harmony. It grew out of the Middle English phrase at on meaning “in harmony,” a phrase echoed in current expressions like “feeling at one with nature.” When atone joined modern English in the 16th century, it meant “to reconcile,” and suggested the restoration of a peaceful and harmonious state between people or groups. Today, atone specifically implies addressing the damage—or disharmony—caused by one’s own behavior.