Using 'didi' signifies respect for an older sister, showing familial closeness and honor in Indian culture. Even after an argument, Sumit respectfully referred to her as his didi.
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Gender Specific
'Didi' explicitly refers to an older female sibling; it's not used for older brothers. At the family reunion, Priya was surrounded by her younger cousins calling her 'didi'.
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Cultural Nuance
'Didi' can be used beyond biological relations, addressing any older woman with affection or respect. Mina, can I call you 'didi'? You're like a big sister to me.