It's usually just TIED UP -- it means you're busy.
Nothing. You have left out part of the idiom. Perhaps you mean "your hands are tied," which means that you have no power to do anything in a given situation.
To tie the knot means to get married. The image is of two people tied together.
It means things are trustworthy.
To make a mistake
About to be sold, or given up.
say no to it
It means to go out into the world and experience life on your own without being tied to your mother's apron strings.
not tied up
It means shut up!
flatter her to get something
To keep struggling and not give up.
he suddenly turned up (to appear, emarge)