put on an act
Pretend, especially in order to deceive; also, show off. For example, We were afraid Charlie had hurt himself, but he was just putting on an act, or We know you're a good swimmer—stop putting on an act. [c. 1930]
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How to use put on an act in a sentence
To put it rather uncharitably, the USPHS practiced a major dental experiment on a city full of unconsenting subjects.
Just the hard-on before you shoot unarmed members of the public.'Babylon' Review: The Dumb Lives of Trigger-Happy Cops|Melissa Leon|January 9, 2015|DAILY BEAST
Kennedy: "Mankind must put an end to war — or war will put an end to mankind."Huckabee 2016: Bend Over and Take It Like a Prisoner!|Olivia Nuzzi|January 8, 2015|DAILY BEAST
Obsessive exercising and inadequate nutrition can, over time, put people at high risk for overuse injuries like stress fractures.How Skinny Is Too Skinny? Israel Bans ‘Underweight’ Models|Carrie Arnold|January 8, 2015|DAILY BEAST
A spokesman for Lewisham council said last year that it would be forced to act if the family returned to Britain.Britain May Spy on Preschoolers Searching for Potential Jihadis|Nico Hines|January 7, 2015|DAILY BEAST
He was voluble in his declarations that they would “put the screws” to Ollie on the charge of perjury.The Bondboy|George W. (George Washington) Ogden
Each day she resolved, "To-morrow I will tell Felipe;" and when to-morrow came, she put it off again.Ramona|Helen Hunt Jackson
This is the place where the Muscovite criminals are banished to, if they are not put to death.
Let them open their minds to us, let them put upon permanent record the significance of all their intrigues and manœuvres.The Salvaging Of Civilisation|H. G. (Herbert George) Wells
Before the spinet a bench was placed about four feet below the keys, and I was put upon the bench.Gulliver's Travels|Jonathan Swift