slip away

Verb

• pass by
  • three years elapsed
    

• leave furtively and stealthily
  • The lecture was boring and many students slipped out when the instructor turned towards the blackboard
    

Related words

• Synonyms: 
  elapse , lapse , pass , slip by , glide by , go by , slide by , go along , steal away , sneak away , sneak off , sneak out