A sting in the tail [BBC - The English We Speak]

source: BBC Learning English     2017年10月23日
[when something unpleasant comes from something supposed to be pleasurable]
Rob has a new hobby that involves the risk of getting stung, which fills Feifei with fear. But 'the sting in the tail' with this new activity has nothing to do with the insects. Find out what this phrase really means.
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