to a teacher.
A man of a higher rank or position.
to a knight or other low member of the peerage.
to a superior military officer.
A respectful term of address to a man of higher rank or position
A respectful term of address to an adult male (often older), especially if his name or proper title is unknown.
To address (someone) using "sir".
teacher
To pass on knowledge generally, especially as one's profession; to act as a teacher.
To pass on knowledge to.
To cause to know the disagreeable consequences of some action.
To cause (someone) to learn or understand (something).