Porque não me canso de aprender, seja em que língua for

Put-on
noun [ C ] uk ​ /ˈpʊt.ɒn/ us ​ /ˈpʊt.ɑːn/ US informal ​ 

An attempt to deceive someone into believing something that is not true: 
She's not really angry - it's just a put-on.