To make strong or increase the strength of.(verb-transitive)
To become strong or stronger.(verb-intransitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "strengthen" in a sentence
"These changes and conditions are meant to enhance this event and in the long-term strengthen all our businesses, by reinforcing our identity as a destination of choice."
"Mr. Liveris said the new terms strengthen his company's financial position compared with late last year, when the collapse of a joint venture with Kuwait left Dow without $9 billion it had planned to use to help pay for Rohm & Haas."
"Duration and repetition strengthen a karmic pattern."