worsen

Etymology

worse + -en

verb

1. (transitive) To make worse; to impair.
   The global warming has worsened the weather.
2. (intransitive) To become worse; to get worse.
   The weather has worsened.
   During the day conditions worsened quickly—for example, a 2-6-0 on the Uckfield line suddenly encountered flood water high enough to enter its ashpan and extinguish its fire—until lock gates up-river at Barcombe gave way and a tidal wave rolled down the valley meeting head-on a spring tide rolling up from the coast. 1961 January, “Talking of Trains: Flooding at Lewes”, in Trains Illustrated, page 5
   TPE's cancellation score worsened from 7.2% to 23.8% when adjusted to include pre-cancellations (P*-coded) owing to a shortage of train crew. April 5 2023, Mel Holley, “Network News: TPE faces uncertain future after high cancellation rate”, in RAIL, number 980, page 8
3. (transitive, obsolete) To get the better of; to worst.