| weaken weaken // verb [+ obj or no obj] 1 to make sb/sth less strong or powerful; to become less strong or powerful: The recession has weakened demand for luxury goods. 2 to make a currency, market etc. move towards a lower level; to fall: If the yen weakens it will help Japan's export sector. Efforts to grab market share would weaken prices for all the competing companies. See note at CURRENCY |