Informal British word for stomach, especially a child's stomach or belly.
From 'tummy,' which is baby talk for stomach. 'Tum' is an even shorter, more informal version commonly used in British English.
Words like 'tum,' 'tummy,' and 'tummy ache' are reduplicative baby talk that somehow made it into adult dictionaries—English adults unironically say 'tummy' instead of 'stomach.'
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