'start up' definitions:

Definition of 'start up'

From: WordNet
verb
Get going or set in motion; "We simply could not start the engine"; "start up the computer" [syn: start, start up] [ant: stop]
verb
Get off the ground; "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" [syn: start, start up, embark on, commence]

Synonyms of 'start up'

From: Moby Thesaurus