stay out        
phrasal verb with stay verb uk/steɪ/ us/steɪ/
B2 在外过夜;晚归
to not come home at night, or to go home late
  Our cat usually stays out at night. 我们家的猫通常在外面过夜。 
 My mum won't let me stay out late. 我妈妈不准我晚上太晚回家。 
 - More examples
- He stayed out last night and I've no idea where he was.
- I've got to get up early tomorrow so I won't be staying out late.
- He gets suspicious if I stay out late.
- He called me to say he'd be staying out.
- I like to let him know if I'm staying out late.