There were Mr. and Mrs. Merriman, a pretty, vivacious little woman in the thirties; her husband, a jovial fellow, something of a shallow-pate, who laughed a good deal at other people’s witticisms, and had thereby made himself extremely popular.
There are no more uses of "witticism" in the book.
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Winston Churchill was well-known for his witticisms.
By the very nature of a witticism, one is given very little time to assess its various possible repercussions before one is called to give voice to it,