1. to go back to an earlier and usually worse or less developed condition or state
Usage: formal

Examples

• The patient’s condition began to retrogress after the initial improvement.
• Without proper maintenance, the building will retrogress to its former dilapidated state.
• The peace talks seemed to retrogress as both sides became more hostile.
• His reading skills appeared to retrogress during the summer break.
• The economy began to retrogress after years of steady growth.
• The team’s performance started to retrogress in the second half of the season.