the front part of a shirt

he ended up with scalding tea down his shirt front

(in Australian Rules) an act of charging into an opponent's chest, typically so as to knock them to the ground

the skipper was booked for a late shirtfront

(in Australian Rules) charge into the chest of (an opponent), typically so as to knock them to the ground

he shirtfronted a Collingwood player in front of the Ryder Stand at Victoria Park