at the front—1. (also: in front) in the position nearest to the front part of smth.:
- A loudspeaker system is a box with a grille at the front through which the sound comes.
2. fighting as a member of the armed forces in a war:
- Women must keep the home industries going for the boys who were fighting at the front.
on the front—
1. on the foremost or most important side of smth.:
- The label on the front of the packet lists the actual net weight.
2. = at the front 2:
- While the Austrian troops were falling back in collapse, German formations on the front retreated with discipline.