| v. t. | 1. | To make strong or stronger; to add strength to; |
| 2. | To animate; to encourage; to fix in resolution. | |
| v. i. | 1. | To grow strong or stronger. |
| Verb | 1. | strengthen - make strong or stronger; "This exercise will strengthen your upper body"; "strenghten the relations between the two countries" Antonyms: weaken - lessen the strength of; "The fever weakened his body" |
| 2. | strengthen - gain strength; "His body strengthened" Antonyms: weaken - become weaker; "The prisoner's resistance weakened after seven days" | |
| 3. | strengthen - give a healthy elasticity to; "Let's tone our muscles" |
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