A sudden or irregular incursion in border warfare; hence, any irregular incursion for war or spoils; a raid.
A brief excursion or attempt, especially outside one's accustomed sphere.
To participate in a foray.
To do or attempt something outside one's typical area of expertise.
The action of irrupting or breaking into; a violent entry or invasion; an inbreaking; an intrusion.
An abrupt increase in the size of a movement or organization.
An abrupt increase of an animal population.