give a hand
Also, lend a hand. Help a person, as in Let me give you a hand with those chairs, or Jane is always willing to lend a hand with refreshments. [Mid-1800s]
Also, give a big hand. Give an enthusiastic round of applause, as in Please give her a hand. One can also be given applause or get a big hand, as in This speaker always gets a big hand. [Early 1800s]
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