Verb > Deteriorate

Verb – Deteriorate

1 (no object) : to become worse as time passes

The weather gradually deteriorated (=worsened) as the day went on.

Her health continues to deteriorate. (=decline)

efforts to save a deteriorating rain forest

The disagreement deteriorated into a fight. (=the disagreement got worse and eventually became a fight)

2 (+ object) : to make (something) worse

Exposure to rain and sun will gradually deteriorate the paint.

deteriorated adjective

a deteriorated (=run-down, dilapidated) building

a badly deteriorated part of the city