The idiom "feel blue" means to feel sad or depressed. The figurative meaning is that the person experiencing these emotions feels weighed down or heavy like a piece of fabric with water droplets on it, causing them to appear gray and dull.

The idiom "till doomsday" means something will last for a very long time, until it becomes unbelievable or impossible to continue. It is often used to describe an extreme amount of time that someone would be willing to wait for something to happen.

The idiom "by the skin of your teeth" means to escape from danger or a difficult situation by a narrow margin or just in time, often due to luck or chance. It is also used to describe someone who manages to achieve something with only minimal effort or skill.

The idiom "sweet tooth" refers to someone who has a strong liking or preference for sweet foods, often to the exclusion of other flavors. It can also be used more generally to describe someone with an overall pleasant or cheerful nature.

The idiom "brought forward" means to present or introduce something earlier than planned or expected, often due to unexpected circumstances or other factors that require immediate attention.