STRENGTHEN /ˈstɹɛŋ(k)θən/ ► audio Scrabble 14 Words With Friends 16 Definition verb make strong or stronger. — synonyms: beef_up, fortify verb gain strength. verb give a healthy elasticity to. — synonyms: tone, tone_up Examples “strengthen a muscle” See all 195 words you can make from STRENGTHEN → 10-letter words Words starting with S Words ending with N ← Unscramble different letters