Simple past tense and past participle of worsen.(verb)
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Use "worsened" in a sentence
"And her expression worsened when she was in the middle of the office and saw his Venus."
"Two months ago, a woman's long thumbnail slashed my cornea; the pain worsened overnight and I had to go to the hospital the next morning."
"Mr. Netanyahu, who remains in Washington and will address the pro-Israel lobby group on Monday, has since sought to downplay what media reports describe as a worsened rift with Mr. Obama, saying Saturday that there will be differences among friends."