Not seeing anyone in the yard, he slipped in, and at once saw near the gate a sink, such as is often put in yards where there are many workmen or cab-drivers; and on the hoarding above had been scribbled in chalk the time-honoured witticism, "Standing here strictly forbidden."
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,