founder -
stumble and nearly fall; "the horses foundered"
stumble,
trip make an error; "She slipped up and revealed the name"
founder -
break down, literally or metaphorically; "The wall collapsed"; "The business collapsed"; "The dam broke"; "The roof collapsed"; "The wall gave in"; "The roof finally gave under the weight of the ice"
change undergo a change; become different in essence; losing one's or its original nature; "She changed completely as she grew older"; "The weather changed last night"
abandon,
give up stop maintaining or insisting on; of ideas or claims; "He abandoned the thought of asking for her hand in marriage"; "Both sides have to give up some claims in these negotiations"