“A short fuse”, “a taste of your own medicine” and “butterflies in my stomach” are some common English idioms. “Down for the count” and “draw the line” are other common English idioms.
“A short fuse” is a common English idiom that means a quick temper.
“A taste of your own medicine” means a bad treatment that one deservingly received for treating others badly.
“Butterflies in my stomach” means being nervous. A new violin player who is nervous about performing before a large audience, for example, often claims to have butterflies in his stomach.
“Down for the count” means that a person is tired or giving up. It can also mean that the person is no longer willing to participate.
“Draw the line” means to stop or know the point at which something goes from being okay to unacceptable.
“Every cloud has a silver lining” is another common English idiom. It refers to the notion that one can find something positive in every bad situation. For example, someone who just got fired from his job is told “every cloud has a silver lining” because at least he no longer has to work for an unappreciative boss.
“Let the cat out of the bag” is another common English idiom that means to tell a secret. Someone who is throwing a surprise birthday party prefers that the guests not let the cat out of the bag or reveal information about the party to the person whose birthday is being celebrated.