de·te·ri·o·rate [ di tree ə ràyt ](past and past participlede·te·ri·o·rat·ed, present participlede·te·ri·o·rat·ing, 3rd person present singularde·te·ri·o·rates)
transitive and intransitive verb
Definition:
become or make worse: to become or make something worse in quality, value, or strength
[Late 16th century. < late Latin deteriorat-, past participle of deteriorare< Latin deterior "worse"]