Synonyms of 'in motion'
▷ See motion
1 in progressDictionary, going on, under wayHis job begins in earnest now that the World Cup is in motion.
2 movingDictionary, going, workingAlways stay seated while a bus is in motion.
Copyright © 2016 by HarperCollins Publishers. All rights reserved.
If you say that a plan or scheme is afoot, it is already happening or being planned, but you do not know much about it.
We all knew that something awful was afoot.
on the move (informal)
Thesaurus for in motion from the Collins English Thesaurus
If a process or event is in motion , it is happening . If it is set in motion , it is happening or beginning to happen .