This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Simple past tense and past participle of harp.

"Palin harped about Letterman apologizing six days too late, and the media is still going at it."

harped    harpes    harping    harps   

retell    restate    reiterate    repeat    ingeminate    iterate    support    play    free-reed instrument   

dital harp    double-action pedal harp    negro harp    harp instrument    to harp on one string    couched harp    david's harp    æolian harp    pointed harp    double harp   

harped    harping    harpist   

constellation    clairschach    kanoon    dwell    about   

Arp    Sharp    Sharpe    Tharp    arp    carp    harpe    karp    scarp    sharp   

flute    lyre    guitar    lute    fiddle    mandolin    piano    trumpet    tambourine    harpsichord