Main entry: embark on, commence, start, start up
Definition: get off the ground
Usage: Who started this company?; We embarked on an exciting enterprise; I start my day with a good breakfast; We began the new semester; The afternoon session begins at 4 PM; The blood shed started when the partisans launched a surprise attack
Definition: get going or set in motion
Usage: We simply could not start the engine; start up the computer