address a person by title or relationship to you; culturally, it's respectful for a younger person to address the elderly; a parent would usually ask their child/children to address the person they see by their relationship, so that everyone will know how they're related. For example, 細伯 sai3 baak3 is used for an older gentleman and 伯母 baak3 mou5 for an older woman.

to greet someone; to ask someone to do something [written and colloquial]