1. On the football field every player is vying for the ball.2. Our manager has resigned. So his position is up for grabs.3. The national championship title of badminton is up for grabs.
 vie for something fight for something something is up for grabsvie for something 很常用，可用在球隊搶球，待業者搶工作等等，up for grabs 指某東西可以被搶或被爭取。< >
I tried to explain how the software works to my dad, but he is low on the uptake.