Sentence:  Suggestions of a <WSD>knee-trembling</WSD> encounter on a snooker table in Bird's gentlemen's club lend the story a Palmerstonesque flavour – legend has it that the Victorian prime minister and old rascal died while potting the balls on the green baize with his maid. 
Meaning of the word marked with <WSD> tags:  Involving a knee-trembler.