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3. a can of worms

a can of worms

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a can of worms

  (informal)

a situation which causes a lot of trouble for you when you start to deal with it Quite what we do with all the waste generated by this industry is another can of worms. Once you start making concessions to individual members of staff, you really open up a can of worms. (= cause a lot of trouble for yourself)

See also: can, of, Worms