Didi

ʌnni iːɒni əʊldə sɪstə bʌt laks ðə flɛksəbɪlɪti ɒv juːsɪdʒ

In Korean 언니 (eonni) - older sister (but lacks the flexibility of usage)

A respectful term of address for an older sister or any woman of similar age, showing respect and affection.