ENGLISH
REFERENCE

sis

n.
US //ˈsɪs// UK //sˈɪs// sis
  1. 1 sister or female friend (n.)
    B1 Intermediate Informal

    a short, informal name for your sister or a very close female friend.

    an informal clipping of 'sister', frequently used as a term of endearment or a familiar address for a female sibling or close associate.

    Example

    Hey sis, are you coming over for dinner tonight?

    Example

    She often referred to her childhood best friend as 'sis', reflecting a bond that felt as strong as any biological relationship.
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