noun
a woman who is married to one's parent but is not one's biological mother
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My stepmum is a kind and caring woman who has always treated me like one of her own children.
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I get along really well with my stepmum, she's like a second mom to me.
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My stepmum is pretty chill, she lets me get away with a lot more than my dad does.
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Having a stepmum in my life has been like gaining an extra guardian angel to watch over me.