In the English language, there are many expressions using the word "mouth". For example, if you say bad things about a person, the person might protest  and say "Do not bad mouth me."     Sometimes, people say something to a friend or family member that they later regret because it hurts that person's feelings. Or they tell the person something they were not supposed to tell. The speaker might say :"I really put my foot in my mouth this time." If this should happen, the speaker might feel down in the mouth.   In other words, he might feel sad for saying the wrong thing.     Information is often spread through word of mouth. This is general communication between people, like friends talking to each other. "How did you hear about that new movie?" someone might ask. "Oh, by word of mouth."     Sometimes when one person is speaking ,he says the same thing that his friend was going to say . When this happens, the friend might say "You took the words right out of my mouth." Sometimes a person has a bad or unpleasant experience with another person ,he might say "I had my heart in my mouth."     Some people have lots of money because they were born into a very rich family. You might say such a person "was born with a silver spoon in his mouth ." This rich person is the opposite of a person who lives from hand to mouth. This person is very poor and only has enough money for the most important things in life.    Parents might sometimes keep sweet food from a child ad punishment for saying bad things,  For example , if a child says things she should not say to her parents , she might be described as a mouthy child. The parents might even tell the child to stop mouthing off. I had my heart in my mouth  has the same meaning as "  _  ".
I had a very unpleasant experience I kept sweet food from a child I had gone through something scary I said things I should not say