WordWeb Online

1. Leave quickly
   - bug out [US, informal]
    
2. Cease to live; lose all bodily attributes and functions necessary to sustain life
   - die, decease [archaic], perish, go, exit, pass away, expire, pass, kick the bucket [informal], cash in one's chips [informal], buy the farm [N. Amer, informal], conk [informal], give-up the ghost [informal], drop dead, choke, croak [informal], snuff it [informal], flatline [informal], cop it [Brit, informal], cash in [informal], pop one's clogs [informal]

Derived forms: popped off, popping off, pops off

Type of: change state, go away, go forth, leave, off [informal], turn