There is something exceedingly unpleasant in being obliged to answer "No," to a traveller's "Pray, Sir, were you ever abroad?" and to sit mum-chance all the time that he is running over the "grimoire" of outlandish technicalities. For my own part, I am convinced that man is, par excellence, a travelling animal; [...]
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I wrote Miss Crane off as mediocre because although she chatted quite pleasantly and intelligently over coffee she was mostly mumpchance at the dinner table. Oh, not mumpchance tout court.
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The two little children stood mumchance, but with a kindly air.
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2001, Paula Marshall, Lord Hadleigh's Rebellion, Harlequin (Mills & Boon), 2008, page 124,
If he did, he would remain mumchance about that, too.
Source: wiktionary
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