Ignore hitboxs for a small amount of time

hey i was wondering how to make it so when my sprite 1 jumps on sprite 2 it disables the hit box. I can't make it so they just don't collide because i need them to collide in other situations. this is my code

void legs()
//same as void update
{
if (Head == true)
//if touching hitbox
{

gameObject.GetComponent<Rigidbody2D>().AddForce(new Vector2(0f, 1f), ForceMode2D.Impulse);
//this is where the hit box would be disabled
}

}