Human: Can you give me a list of the most common idioms? Assistant: 

1. To be on pins and needles (n): to feel anxious or tense about something that is uncertain or in doubt.
2. To pull oneself up by one's bootstraps (idiom): to achieve success through hard work and determination.
3. To have an ace up one's sleeve (idiom): to have knowledge or information that could come into play at some point during a situation.
4. To keep one's cards close to one's chest (idiom): to not reveal all of one's plans or intentions.
5. To be under the weather (idiom): to feel unwell or unwell enough to stay home from school or work.