noun
a person's grandmother by marriage, especially the mother of one's spouse
preposition
in-law (indicating a relationship by marriage)
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My grandmother-in-law is a kind and wise woman who always offers me valuable advice.
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I get along really well with my grandmother-in-law; she's a cool lady.
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My grandma-in-law is the bomb - she always knows how to have a good time.
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My grandmother-in-law's love is like a warm embrace that comforts me in times of need.