a banana skin

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a banana skin

An action that results in an unforeseen and embarrassing mistake or problem. When Joe applied the latest software update, he had no idea what a banana skin it would be until after his company's entire network crashed.
See also: banana, skin

a banana skin

  (British)
something which causes or is very likely to cause embarrassing problems The new tax has proved to be a banana skin for the government.
See also: banana, skin