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The function you are looking for is called OnTriggerEnter2D
void OnTriggerEnter2D(Collider other) {
if(other.gameObject.tag == "Floor")
//You lost
}
You need to place this function in a Scrip in the bird gameobject, then add colliders to the bird and the floor, and assign a tag to the floor so you can check inside the OnTriggerEnter2D is the bird crashed against the floor.
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solved how create function for flappy bird game? [duplicate]