Someone who rules or controls something with a mailed fist is in absolute control and tolerates no dissent. A mailed fist in a velvet glove is used to describe someone who appears soft on the outside, but underneath is very hard. 'Iron fist' is an alternative form.
Mark my words is an expression used to lend an air of seriousness to what the speaker is about to say when talking about the future. You often hear drunks say it before they deliver some particularly spurious nonsense.
If somebody can't retain things for long in his or her memory and quickly forgets, he or she has a memory like a sieve. A sieve has lots of tiny holes in it to let liquids out while keeping the solids inside.
If something's a moot point, there's some disagreement about it: a debatable point. In the U.S., this expression usually means that there is no point in debating something, because it just doesn't matter. An example: If you are arguing over whether to go the beach or to the park, but you find out the car won't start and you can't go anywhere, then the destination is said to be a moot point.
This expression indicates a person's determined intention of getting a work done in spite of all odds he may face. He will use all and every means to accomplish the target. Example: He moved heaven and earth to get his literary work recognised by the committee of experts.
(USA) Derived from the act of moving the chains in an American football game when a team gets a first down, this expression describes taking a project to the next step, especially one that has lost its momentum for one reason or another. Example: Frustrated with our lack of progress, our boss finally shouted, "Make a decision today about which one to use, and let's move the chains on this."