profile有形象的意思。keep a high profile就是表示“一直保持高的形象”，引申为“保持高调”的意思。

【例句】
He is superstar who keeps a high profile.
他是一个高调的巨星。

He resigned from a high-profile job as economic adviser to the president.
他辞去了总统经济顾问这一备受关注的职位。