1. Third person singular preterite of 'regressar-se' or reflexive form of 'regredir' - to move backward, to go back to a previous state or condition
The patient's condition regressed after stopping the medication.
O estado do paciente regrediu-se após parar a medicação.
2. To return to a former, usually worse or less developed state
The company regressed to outdated business practices.
A empresa regrediu-se para práticas comerciais desatualizadas.
3. To retreat or move back in space or time
The troops regressed when faced with stronger resistance.
As tropas regrediu-se quando enfrentaram resistência mais forte.