not to be outdone

Not to be outdone = not wanting sb else to do sth better than you سر کم نیاوردن
. Not to be outdone, Vicky and Laura reached the same standard
. Pat was wearing an outrageous backless purple dress, so, not to be outdone, I put on my new gold and black trouser suit

برای عقب نماندن از قافله

ناگفته نماند

برای آنکه کم نیاره

از قافله عقب نماندن

- برای عقب نماندن از قافله

بهتر از این نمیشه
معنی گرفته شده از دیکشنری آنلاین Longman :
in order not to let someone else do better or seem better than you