cold hands, warm heart

Undemonstrativeness need not signify lack of feeling. In the singular the term appears in a collection of sayings published by Vincent Lean in 1902 (“A cold hand and a warm heart”). A similar idea is behind Alan S. Blinder’s book on economic policymaking, Hard Heads, Soft Hearts (1987), which claims it is not only possible but necessary to have an economic policy that is both rational and efficient (hardheaded) and socially compassionate (softhearted).
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cold fish, a

A person who is unfeeling, or at least shows no emotion. “Cooler than a fish on a cake of ice,” P. G. Wodehouse put it (Money in the Bank, 1942). He was scarcely the first. Shakespeare wrote, “It was thought she was a woman and was turned into a cold fish” (Autolycus telling of a ballad against the hard hearts of maids, TheWinter’s Tale, 4.4). See also COLD HEART
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cold feet, to get/have

To be timid; to back off from some undertaking. This expression appears to date from the nineteenth century, at least in its present meaning. In the early seventeenth century it was an Italian proverb that meant to have no money; it was so used by Ben Jonson in his play Volpone. The source of the more recent meaning is obscure. Some believe it comes from soldiers retreating in battle because their feet are frozen. Another source cites a German novel of 1862 in which a card player with- draws from a game because, he claims, his feet are cold.
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cold enough to freeze the balls off a brass monkey

Frigid, extremely cold. This term, already known by 1835, comes from naval warfare, in the days when cannonballs were stacked in pyramid form on brass trays called “monkeys.” In cold weather the metal would contract and the balls fall off. For a similar hyperbole, see CHILLED TO THE BONE.
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cold comfort

That’s little or no consolation. “Colde watz his cumfort,” reads a poem of unknown authorship written about 1325. The alliterative phrase appealed to Shakespeare, who used it a number of times (in King John, The Tempest, The Taming of the Shrew). It acquired cliché status by about 1800. Stella Gibbons used it in the title of her humorous book Cold Comfort Farm (1932).
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cold blood, in

Calculatedly ruthless. This expression comes from the days when it was commonly believed that blood rules the temper and was boiling hot when one was excited and ice-cold when one was calm. The French call it sang-froid, a term taken over in English with the same meaning. Thus Byron wrote of Don Juan, “Cross-legg’d with great sang-froid among the scorching ruins he sat smoking.” In more recent times Truman Capote used the term as the title of a detailed account (1965) of a deliberate act of murder
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coin a phrase, to

To fashion an expression. This term, dating from the 1940s, is often used ironically to apologize for using a cliché, as in “He acts like the cock of the walk, to coin a phrase.” Of course it can also be used straightforwardly and refer to inventing an expression, a usage dating from the late 1500s.
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