What are some idioms related to fear and anxiety?

There are several idioms related to fear and anxiety. Here are a few examples:

1. "Bite your nails": This idiom means to be very nervous or anxious about something.
2. "Jump out of your skin": This idiom is used to describe a sudden and extreme reaction to fear or surprise.
3. "Have butterflies in your stomach": This idiom refers to the feeling of nervousness or anxiety in the stomach, often experienced before a big event or important situation.
4. "Scared stiff": This idiom means to be extremely frightened or terrified.
5. "Cold feet": This idiom is used to describe a sudden loss of courage or confidence, often experienced before a challenging or intimidating task.
6. "Shake like a leaf": This idiom means to tremble or shake uncontrollably due to fear or nervousness.
7. "Heart in your mouth": This idiom describes the feeling of extreme fear or anxiety, often accompanied by a racing heartbeat.
8. "On edge": This idiom means to be in a state of nervousness or anxiety, feeling tense or easily startled.
9. "In a cold sweat": This idiom refers to the physical reaction of sweating profusely due to fear or anxiety.
10. "Scare the living daylights out of someone": This idiom means to frighten someone very much, causing extreme fear or panic.

These idioms are commonly used to express various degrees of fear and anxiety in everyday conversations.