E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Walk through Ones Part (To).
A theatrical phrase, meaning to repeat ones part at rehearsal verbally, but without dressing for it or acting it. To do anything appointed you in a listless indifferent manner.
A fit of dulness, such as will at times creep over all the professors of the fine arts, arising either from fatigue or contempt of the present audience, or that caprice which tempts painters, musicians, and great actors to walk through their parts, instead of exerting themselves with the energy which acquired their fame.Sir W. Scott: Redgauntlet, chap. xix.