The brother of one's spouse. / The husband of one's sibling. / The husband of the sibling of one's spouse. / The brother of the spouse of one's sibling.

Husband or wife of one's cousin. / Cousin of one's husband or wife.

(law) The body of law dealing with the private relations between members of a community; it contrasts with criminal law, military law and ecclesiastical law.

(law) The area of law pertaining to crime and punishment. / (law) A specific statute, ordinance, regulation, or other source of law that deems an action to be a crime.

Someone's niece's husband / Someone's sibling's son-in-law / Someone's spouse's sibling's son-in-law / Someone's husband's nephew. (Usually called a nephew.)

(Britain, law) A former (1824–1981) law by which police officers were permitted to arrest anyone under suspicion of having committed a crime

Someone's nephew's wife. / Someone's sibling's daughter-in-law. / Someone's spouse's sibling's daughter-in-law. / Someone's husband's niece. (Usually called a niece.)

(chiefly UK) The principle that what can go wrong, will go wrong, usually with some observed degree of irony

An adage which states that if anything can go wrong, then it will.

(euphemistic) wiretapping