To make or become stronger or more determined.
Stoutening can make people think of being brave or not giving up.
Examples:
She tried to stouten her heart before the big race.
He will stouten his resolve and not give up.
The team will stouten their efforts to win the game.
I need to stouten my courage to talk to the teacher.
He stoutened his determination and climbed the big mountain.
The knight stoutened himself before going into the dark cave.