Idiom also refers to a dialect or jargon of a group of people,ethier in a certain region or a group with common interest ,like SCIENCE,music,art or business                                                                                                                                           EX.1 .CUT THE GROUND FROM UNDER FEET -when u cut the ground from uder someones feet,u do something which weakness their position                                      2.WHOLE BAG  OF TRICKS-means trying all the clever means to acheive something                                                                                                                  3.EXPLORE ALL AVENUES -try out every possibility to get a result.    
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Crocodile tears -- fake tears (PLASTIK) XD
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