not be someone's day idiom
…身处逆境，不走运，倒霉
If it is not your day, you are having a difficult or unpleasant day.
This really isn't my day - my wallet was stolen and now I've lost my car keys. 今天我可真够倒霉的——先是钱包被偷，现在车钥匙又丢了。
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