E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Pickwickian.
In a Pickwickian sense. An insult whitewashed. Mr. Pickwick accused Mr. Blotton of acting in a vile and calumnious manner, whereupon Mr. Blotton retorted by calling Mr. Pickwick a humbug. It finally was made to appear that both had used the offensive words only in a Pickwickian sense, and that each had, in fact, the highest regard and esteem for the other. So the affront was adjusted, and both were satisfied.
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Lawyers and politicians daily abuse each other in a Pickwickian sense.Bowditch.