"Fight for oneself" 的英文表达是 "fight for oneself" 或 "fight for one's own cause"。这个短语源自英语中的战斗用语，表示为了自己的目的而奋斗，不担心外界的干扰或压力。
例句：
He always fights for himself, regardless of what others think.
She never gave up fighting for her own cause, even in the face of adversity.
中文翻译：
他总是为自己而战，不管别人怎么想。
她在面对困难的情况下始终坚持为自己的事业而战。