Assertion: kettle's water | /r/HasProperty | put in a tea kettle
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text: Certainly it avoids giving any support to a popular but probably fanciful idea about the derivation of “kettling” which has often been suggested by opponents of the tactic: that kettling is called “kettling” because, just as water is put in a tea kettle to boil, protesters are put in a police kettle to make them “boil” with anger.