Losing the job was a blessing in disguise, she is able to spend more time with her children now.
a blessing in disguise则表示表面上看是不好的事，实际上是好的事，也就是塞翁失马，有因祸得福的意味。
失去工作其实是因祸得福，现在她有更多时间陪同孩子。
disguise有假扮和伪装的意思，介词短语in disguise则表示经过乔装打扮的意思（见下例）；
The criminal entered the bank in disguise.
犯人乔装进入银行。