something very easy to do
非常に簡単なこと (hijō ni kantan na koto)
"The exam was a piece of cake for her."
"彼女にとって試験はお茶の子さいさいだった。" (Kanojo ni totte shiken wa **ocha no ko saisai** datta.)
to express an idea clearly so that others understand it
to write something so you remember it
to make a decision without enough information
to have more power or advantage over others
To become an important news story
to experience the same unpleasantness you caused to others
