Lean on Definition 1 of 3Pro Tip 1/3Emotional Support Use 'lean on' when expressing emotional dependency or seeking comfort during difficult times. After the loss, she needed someone to lean on. Pro Tip 2/3Not Literal 'Lean on' often means emotional rather than physical support when used idiomatically. During the crisis, he leaned on his friends for support. Pro Tip 3/3Trust Implied Implies a high level of trust in the person or thing you are depending on. Businesses lean on reliable suppliers to meet demand.