be up a gum tree

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be up a gum tree

  (British & Australian old-fashioned) also be up a tree (American old-fashioned)
to be in a very difficult situation
Usage notes: A small animal in Australia called a possum climbs up a gum tree when it is being chased.
If the insurance company won't pay for the damage, I'll be up a gum tree.
See also: gum, tree, up