Wiktionary
get going
vb. 1 To leave, or depart. 2 To begin or commence.
WordNet
get going
v. begin or set in motion; "I start at eight in the morning"; "Ready, set, go!" [syn: start, go] [ant: stop]
start to be active; "Get cracking, please!" [syn: get cracking, bestir oneself, get moving, get weaving, get started, get rolling]