Longman Dictionary of Contemporary English - ouija board

~ n trademark a board with letters and signs on it, used to try to receive messages from the spirits of dead people ounce ~ n 1 written abbreviation oz a unit for measuring weight equal to 28.35 grams  (- see also fluid ounce) 2 not an ounce of sense/truth/decency no sense etc at all  (If you had an ounce of sense you wouldn't believe these stupid rumors!) 3 every (last) ounce of courage/energy/strength all the courage etc that you have  (He clung to the rock with every last ounce of strength in his body.)