تعريف have seen one's day في الإنجليزية الإنجليزية القاموس.
To be at the point in a life cycle or career of no longer being useful or effective; to be worn-out
Written off by most observers as a champion who had seen his day, the Sampras who stalked the courts as world number one for six straight years in the 1990s rose from the ashes to add to his lustre with a record-setting 14th Grand Slam title.