Definition of start inchiefly US, informal
- He took a break from painting to eat lunch, then started in again.
: to move suddenly and violently : spring
: to react with a sudden brief involuntary movement
: to issue with sudden force
: a sudden involuntary bodily movement or reaction
: a brief and sudden action or movement
: a sudden capricious impulse or outburst
What made you want to look up start in? Please tell us where you read or heard it (including the quote, if possible).