Idiom Definition:
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"to preach to the choir"
to lecture or tell people something that they already know, understand, agree with or believe in
Synonyms:
additional, bombastic, causeless, dispensable, extravagant, futile, gratuitous, inessential, iterating. long-winded, loquacious, padded, palaverous, periphrastic, redundant, reiterating, superfluous, surplus, tautology, tautological, unnecessary, verbose, wordy