1 serviceman, servicewoman, recruit, fighter, infantryman, foot-soldier, trooper, warrior, military man, man-at-arms, Brit Tommy (Atkins), US enlisted man or woman, Colloq Brit squaddie, US GI or G.I. (Joe), Old-fashioned (WWI) doughboy:
Enemy soldiers had been reconnoitring our position during the night.
2 fighter, stalwart, supporter, militant:
He has been a soldier in the fight against poverty all his life.
3 serve (in the army):
In his family the men have been soldiering for generations.
4 soldier on. continue, persist, persevere, endure, drive, keep going, keep on or at, grind, drudge:
Despite the set-backs, they soldiered on to complete the project in time.