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The word "dog" is a common word that we all know but this word helps to form many interesting English expressions, which you might find useful in your daily speech.
You would hit the person who called you a dog, but you would smile at him if he called you a tiger. And you might get angry if told that you were going to be the dogs. We hear the ugliest people are described as dogs. A bad actor, a broken-down automobile and a cheap product are all called dogs. The poor dog! He has to put up with such distressing fact and dishonor. Still things could be worse for the oppressed animal as the Bible says: If the Bible offers no hope to man’s great and loyal friend, There is a very old expression that he might find more helpful: Every dog has his day. Even Shakespeare’s Hemlet noted : The cat will meow and the dog will have his day. When an oppressed man hears these words he feels lifted with hope.
There is one kind of behavior that especially angers us, that is, when a man cannot have or enjoy something, he will not let anyone else do so. We say he is acting like the dog in a manager. This expression comes from Aesop, the ancient Greek writer of fables, who tells us how the dog barked at the ox and tried to bite it when it went close to the manager to get at the straw. The dog could not eat the straw, therefore, he didn’t let the ox do so.