epinephrine: a catecholamine secreted by the adrenal medulla in response to stress (trade name Adrenalin); stimulates autonomic nerve action
hormone: the secretion of an endocrine gland that is transmitted by the blood to the tissue on which it has a specific effect
overbid: (bridge) a bid that is higher than your opponent's bid (especially when your partner has not bid at all and your bid exceeds the value of your hand)