The phrase "mean mug" is usually found in literature.The word "mug" in this context is a slang word for face and the phrase "mean mug" is generally meant to convey a description of a face as cruel,...
A metaphor for information or weapon that has potential to harm the user as well as the person it is used upon. Similar to the phrase "a double-edged sword" or information which "can cut both ways."
It means that the person is as important to you as is the entire world. You care for them as much or more than all of the wealth in the world. That they are your world and your interests revolve...
This phrase means that words are stronger than physical force. If you fight someone (use "the sword" because that's all the weapons they had when this phrase was invented), you might beat him now....