In a manner that expresses regret, repentance, or an attempt to make amends for wrongdoing.
From atoning (present participle of atone) + -ly adverbial suffix. Creates an adverb that modifies verbs to show how an action is performed.
Adding '-ly' to an action word to make an adverb is one of English's most productive word-building tricks—it works with nearly any verb describing an emotion or manner.
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