In the following question, out of the given four alternatives, select the alternative which best expresses the meaning of the Idiom/Phrase:
To put somebody to sword

The correct answer is (b) To slay or execute someone.
Explanation:
The idiom "To put somebody to sword" means to kill or execute someone, typically in battle.
Meanings of all options:
· To be well-informed or up-to-date: Being aware of current events or facts.
· To slay or execute someone: To kill, especially in a violent manner.
· To deceive someone: To trick or mislead.
· To give challenge: To confront or provoke someone to a contest.
Example:
"The king ordered his men to put the captured rebels to the sword."