: to make (someone or something) stronger, more forceful, more effective, etc.
: to become stronger, more forceful, more effective, etc.
of money : to increase in value when compared to money from other countries
What made you want to look up strengthen? Please tell us where you read or heard it (including the quote, if possible).
Take Our 10-Question Quiz
The commonly misspelled words quiz
How strong is your vocabulary?
The Vocab Quiz Game for iPhone & iPad
"Incredibly fun and addictive. And informative!" User Review, iTunes