hope against (all) hope
To continue to hope for something even though it seems unlikely to happen. I know she said that she wasn't going to come home for Christmas, but I'm hoping against hope she'll change her mind.
hope against (all) hope
to have hope even when the situation appears to be hopeless. We hope against all hope that she'll see the right thing to do and do it. There is little point in hoping against hope, except that it makes you feel better.
hope against hope
Hope or wish for with little reason or justification, as in I'm hoping against hope that someone will return my wallet. This expression, based on the biblical "Who against hope believed in hope" (Romans 4:18), was first recorded in 1813.
hope against hope
cling to a mere possibility. 1995 Bill Bryson Notes from a Small Island I plodded on, hoping against hope that there would be a pub or cafe in Kimmeridge.
ˌhope against ˈhope (that...)
continue to hope for something, even if this seems useless or foolish: It was a couple of days since the earthquake, but the family were still hoping against hope that their son was safe. hope against hope
To hope with little reason or justification.