Lose energy is a phrase that describes the feeling of being exhausted and having no energy left. WANE (4 letters) means to gradually decrease in size, intensity, or strength. FADE (4 letters) means to gradually become weaker or less distinct. DROOP (5 letters) means to become limp or hang down. FLAG (4 letters) means to become weak or lose energy. SAG (3 letters) means to DROOP or bend from or as if from pressure or weight. TIRE (4 letters) means to become weary or exhausted. Tireout (7 letters) means to exhaust or wear out completely. Runoutofsteam (13 letters) means to become exhausted and have no energy left.