To serve in the military. Both my grandfathers saw service in World War II.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
1 be in the army, navy or air force: He saw service in Korea and later in Vietnam.
2 be used: This new type of engine won’t see service until next year.
Farlex Partner Idioms Dictionary © Farlex 2017