The phrase "authorities deteriorated" is grammatically correct but may not be the most common usage in written English.
It can be used in contexts discussing the decline or worsening condition of authorities or governing bodies over time.
Example: "In recent years, the public's trust in the government has diminished, and many believe that the authorities deteriorated due to corruption and mismanagement."
Alternatives: "authorities declined" or "authorities weakened".
Relations between the Guerrero´s self-defence groups and the authorities have deteriorated further since the arrest in August of the charismatic female leader of another self-defence group in Olinalá, four hours drive into the mountains from Tixtla.
It followed an Ofsted inspection that concluded relationships between governors, school staff and the local authority had deteriorated markedly; actions by the governing body were increasingly undermining senior leaders; and governors were becoming too involved in operational matters.
And if the PA's authority deteriorates in the West Bank, the jihadists, who have never thrived where the comparatively moderate and nationalist Islamism of Hamas held sway, could grow stronger there too.A less alarmist view is that Israel and Palestine could potter along as they are now for a long time.
Rapid health-risk assessment of chlorinated sewage-effluent irrigation of lawns, fields and crops adjacent to populated areas at the University of Western Sydney was carried out in response to warnings from the supplying authority of deteriorating bacteriological quality of the water.
It gave a disaster human scale, and also projected calm and authority as circumstances deteriorated.
However, as relations between the Soviet Union and North Korea deteriorated, the authorities acted to de-emphasise Korean language education and reduce the influence of North Korea within the community; by the early 1970s, Sakhalin Koreans were once again encouraged to apply for Soviet citizenship.
Johnston's travails continued even as he cooperated with Union authorities, his health deteriorating.
Israel has repeatedly warned Egypt's new authorities of the deteriorating situation and the growing militancy in Sinai.
Conditions improved considerably in owner-occupied housing, as the owners in apartment buildings were able to ensure the enforcement of maintenance rules, but public housing, owing to a lack of funds from local authorities, continued to deteriorate.
Trading has deteriorated because local authorities are spending less on residential care and the company is earning less from fees.
