A son of one's cousin or cousin-in-law
A son of one's sibling, brother-in-law, or sister-in-law; either a son of one's brother (fraternal nephew) or a son of one's sister (sororal nephew).
A respectful term of address to an adult male (often older), especially if his name or proper title is unknown.
A man of a higher rank or position.
to a teacher.
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
To address (someone) using "sir".