That is when somebody does something to you and you do the same back to him or her.
"To blow one's own trumpet" is an idiom that means to boast or boastfully talk about one's achievements or qualities.
any one occasion when you tried to pay someone back in his/her own coin
"A big fish in a small pond" is an idiom that can describe someone who is boastful or arrogant in a small or limited setting.
It means that everybody like what they like and have their own opinions about things.
Yes, you can change an idiom with your own words, but it may lose its original meaning or impact. Idioms are commonly used phrases in a particular language that have a figurative meaning. Modifying them may result in confusion or a loss of the intended message.
No because you can figure out the meaning on your own. If you drag your feet, you're moving slowly.
It means that you really know it well. Think how well you know what the back of your own hand looks like!
Nobody really knows who first said this idiom.
The idiom "work itself out" means that a situation will resolve or improve on its own without requiring direct intervention or action. It suggests a belief in the natural course of events to lead to a positive outcome.
Each idiom has its own origins - you'll have to look up the etymology of every one separately.
The idiom "take a leaf out of somebody's book" means to imitate or learn from someone's actions or behavior in order to improve oneself or achieve a similar outcome.
To retaliate means to hit back. If someone deliberately did something bad to you, you retaliated if you got your own back.