If or when push comes to shove, the situation has become some bad that you are forced to do something:
If push comes to shove, we'll just have to use our savings.
If you put on a brave face, or put a brave face on something, you behave confidently or cheerfully even though things are difficult. ('Brave front' is also used.)
A Pyrrhic victory is one that causes the victor to suffer so much to achieve it that it isn't worth winning.
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