wriggle out of something 
phrasal verb with wriggle verb uk/ˈrɪɡ.əl/ us/ˈrɪɡ.əl/
  informal      
 逃脱,避开
to avoid doing something that you do not want to do
  He promised he'd help me paint the living room, but now he's trying to wriggle out of it. 他答应过会帮我粉刷客厅,但现在又想躲开。