1. a gradual or sudden decrease in someone's career performance, status, or success
After the scandal, his professional decline was inevitable.
Após o escândalo, seu declínio profissional era inevitável.
2. the deterioration of one's skills, reputation, or position in their field of work
Her professional decline began when she stopped updating her skills.
Seu declínio profissional começou quando ela parou de atualizar suas habilidades.