To make or become stronger or more powerful. The government plans to strengthen the economy by investing in infrastructure.
To reinforce or fortify a structure or material. They decided to strengthen the bridge to ensure it could handle increased traffic.
To increase the intensity or effectiveness of something. The coach implemented new strategies to strengthen the team's defense.
To improve or enhance a skill, ability, or quality. She took additional courses to strengthen her knowledge in computer programming.
To gain strength, force, or value; to improve in performance or condition (intransitive). The dollar strengthened against major currencies after the announcement.