leave furtively and stealthily(v)

Synonyms: slip away sneak away sneak off sneak out steal away

Hypernyms: go away go forth leave

Examples: The lecture was boring and many students slipped out when the instructor turned towards the blackboard

pass by(v)

Synonyms: elapse glide by go along go by lapse pass slide by slip away slip by

Hyponyms: fell fly vanish

Hypernyms: advance go on march on move on pass on progress

Examples: three years elapsed