► 名詞お姉さん  [(2)おねえさん]  [coll]    
meaning:  sister  rank: 2☆ お
前のお姉さんすげえ
美人だな ⇨ Your big sister is a beauty  
(☛ An older sister)お姉さん  [(2)おねえさん]  [coll]    
meaning:  woman  rank: 2☆ お
店のお姉さん ⇨ A female clerk at the store  
(☛ Typically used by children to address a stranger young woman)