worsen

v. get worse, deteriorate; make worse, aggravate, exacerbate

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Verb
1. grow worse; "Conditions in the slum worsened"
(synonym) decline
(antonym) better, improve, ameliorate, meliorate
(hypernym) change state, turn
(hyponym) inflame
(derivation) deterioration, decline in quality, declension, worsening
2. make worse; "This drug aggravates the pain"
(synonym) aggravate, exacerbate, exasperate
(antonym) better, improve, amend, ameliorate, meliorate
(hypernym) change, alter, modify
(hyponym) irritate
(derivation) worsening

v. zhoršit (se)

Czas. pogarszać; pogarszać się

(v. t.)
To make worse; to deteriorate; to impair.
  

(v. t.)
To get the better of; to worst.
  

(v. i.)
To grow or become worse.