pocket dial      
 verb [ T ] mainly US informal uk/ˈpɒk.ɪt ˌdaɪ.əl/ us/ˈpɑː.kɪt ˌdaɪ.əl/ -ll- or -l-
 口袋内手机误拨电话
to call someone's phone unintentionally by sitting or pressing on your phone while it is in your pocket
 Synonym: butt-dial 
pocket dial      
noun [ C ] mainly US informal uk/ˈpɒk.ɪt ˌdaɪ.əl/ us/ˈpɑː.kɪt ˌdaɪ.əl/
 口袋内手机误拨电话
a phone call that someone makes unintentionally by sitting or pressing on their phone while it is in their pocket
 Synonym: butt-dial