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deteriorate

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verb [intransitive] deteriorate pronunciation in British English /dɪˈtɪəriəreɪt/ 
Word Forms
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present tense
I/you/we/theydeteriorate
he/she/itdeteriorates
present participledeteriorating
past tensedeteriorated
past participledeteriorated
  1. to become worse

    The weather deteriorated rapidly so the game was abandoned.

    deteriorate into:

    The economic situation could quickly deteriorate into social unrest.

derived word

deterioration

 deteriorate pronunciation in British English /dɪˌtɪəriəˈreɪʃ(ə)n/  noun [uncountable]

creep

used with other nouns to describe the unexpected and often unwanted effects of a particular situation or trend

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sandwich woman

a woman in middle age who has to juggle caring for teenage children and ageing parents with a career

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