Unknow plane Synonyms

Unknow replaced

Synonyms for phrase

UP abbreviation

UP is an abbreviation for Unknow Plane
What does UP stand for?
UP stands for "Unknow Plane"

Definitions for Plane


  • (adjective) having a surface without bends, breaks, or irregularities
  • (noun) a vehicle for traveling through the air that has fixed wings for lift
  • (verb) to make free from breaks, curves, or bumps