godsend
noun [ S ] informal uk/ˈɡɒd.send/ us/ˈɡɑːd.send/
（尤指在需要的时候适时来到的）天赐之物，令人喜出望外的事物，及时雨
something good that happens unexpectedly, especially at a time when it is needed
The grant was a real godsend, especially considering the theatre was going to be shut down next month. 特别是考虑到剧院原定下个月就要关闭了，这笔拨款来得真是及时。