strengthen

英 ['streŋθ(ə)n; -ŋkθ(ə)n] 美['strɛŋθn]

• vt. 加强；巩固
• vi. 变强；变坚挺

1. make strong or stronger;

"This exercise will strengthen your upper body"

"strenghten the relations between the two countries"

2. gain strength;

"His body strengthened"

3. give a healthy elasticity to;

"Let's tone our muscles"