सर

In a sentence

• यह सर का निर्णय था।

  This was Sir's decision.

  Here, 'सर' represents 'sir' as a polite formal address for a senior individual.

• कटते हुए बालों के लिए सर झुकाया गया।

  The head was bowed for cutting the hair.

  In this sentence, 'सर' denotes the 'head' as a physical part of the body.

• सर, कृपया यह दस्तावेज़ देख लें।

  Sir, kindly review this document.

  Here, 'सर' is used as a respectful form of address to a person in authority or a teacher.