The idiom 'to stand one's ground' means to 'remain firm'. This expression has come down from the battlefield as it was primary a phrase associated with wards. Before a battle begins, the soldiers take up their arms and move to the allocated positions, and stand firmly, waiting for an order to attack or to defend an attack. Standing one's ground conveys that soldier-like tendency to remain firm.
1. He did not yield to pressure and stood his ground till he won the game.
2. Sachin stood his ground at one end though wickets falling at the other end.
3. One should stood his ground irrespective how much he earns.