Manner means the way something is done or happens. In the plural, 'manners' usually refers to polite behavior and how you act around other people.
From Old French 'maniere', from Latin 'manuarius' meaning 'of the hand', from 'manus' (hand). It originally referred to a way of handling or doing something.
Your 'manners' are literally your 'way of doing things', especially with other people. That’s why we talk about 'table manners', 'bedside manner', and 'in a manner of speaking'—all about style, not just content.
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