go backward to an earlier state

regress

verb|/rɪˈɡres/

To return to a previous or less developed state; to move backward

Examples

In a meeting

The model started to regress after we added too many variables, showing signs of overfitting.

Over coffee

My phone's battery life regressed significantly after the latest update.

Why this word

decline

Regress means to return to a previous, less developed state, while decline is general worsening

worsen

Regress specifically indicates backward movement to earlier condition, while worsen is deterioration without directional implication

deteriorate

Regress emphasizes reverting to primitive or earlier state, while deteriorate is gradual breakdown

Usage tip

Essential in statistics ('regression analysis') and when describing performance degradation. Opposite of progress; implies unwanted backward movement.

Etymology

Latin regressus from regredi (to go back) from re- (back) + gradi (to step)

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