To have the courage or determination to deal with something difficult or unpleasant.
It means being brave or strong when things are hard.
Examples:
She stomached the scary movie and didn't get scared.
I stomached the bad taste of the medicine.
He stomached the long walk and didn't complain.
I stomached the broccoli even though I don't like it.
She stomached the giant sandwich and ate it all.
He stomached the big test and did very well.