worsen as in grow worse

• "Conditions in the slum worsened"

Synonyms

• declinechange toward something smaller or lower ; a condition inferior to an earlier condition; a gradual decrease; a downward slope or bend ; grow worse; refuse to accept; show unwillingness towards; grow smaller; go down; go down in value; inflect for number, gender, case, etc.

worsen as in make worse

• "This drug aggravates the pain"

Synonyms

• aggravatemake worse; exasperate or irritate
• exacerbatemake worse; exasperate or irritate
• exasperateexasperate or irritate ; make furious ; make worse