strengthen verb definition in Exercise topic from the Oxford Advanced Learner's Dictionary

strengthen

 verb: Exercise topic
to become stronger; to make somebody/something stronger Her position in the party has strengthened in recent weeks. Yesterday the pound strengthened against the dollar. The wind had strengthened overnight. The fall in unemployment is a sign of a strengthening economy. strengthen somebody/something Repairs are necessary to strengthen the bridge. The exercises are designed to strengthen your stomach muscles. The move is clearly intended to strengthen the President's position as head of state. The new manager has strengthened the side by bringing in several younger players. Their attitude only strengthened his resolve to fight on. The new evidence will strengthen their case. The experience of bereavement can strengthen family ties.