one–one
Definition
adj.
One at a time. One by one.

A child has the same attitude and characteristics of his father.
Young people don't have enough experience to know the danger they face in many situations.
Children who don't listen to sound advice will learn things the hard way.
Children who don't listen to sound advice will learn things the hard way.
Mind your own business and stay out of things that do not concern you.
Family ties are much stronger than friendship.