If you have something down pat, you understand it totally. This phrase can be used when you have learned a new skill, or memorized something. You say "I have that down pat," when you are confident...
The expression is: to go out on a limb. The image is of a person on a limb in a tree, moving out away from the trunk, where the the branch is perhaps too thin to support his weight. It means putting...
To "live down" means to live long enough so that an embarrassing moment is no longer remembered. You usually hear this in terms of someone "living down" something they did that everyone keeps making...
If something is a let-down, it is a disappointment. The image here is that you have built up your hopes. You are looking forward to something, and when it does not occur, you feel as if you have been...