upon my word
说实在话
(upon) my word
used to show that you are surprised about sth （表示惊奇）哎呀,咦 old-fashioned
once upon a time
used,especially at the beginning of stories,to mean ‘a long time in the past’ （用于故事的开头）从前,很久以前
on no account：not on any account
not for any reason 决不；绝对不