The idiom "once bitten, twice shy" means that someone who has had a negative experience is more likely to be cautious or hesitant in the future.

The idiom "sit tight" means to remain calm, stay patient, or wait quietly for something to happen. It can also mean to be cautious, keep one's distance, or avoid making any sudden moves or decisions.

The idiom "absence makes the heart grow fonder" means that someone may miss or long for someone more when they are away, even if they didn't appreciate them much while they were present. The phrase implies that time apart can bring about a deeper appreciation and affection for someone.

The idiom "in the good books" means to be considered in a favorable or positive light by someone, usually an authority figure or a person of power. It can also refer to being well-liked or respected by one's peers or colleagues.

"As nice as ninepence" is an idiom that means "to be very pleasant, kind, or agreeable." It is commonly used to describe someone who behaves in a friendly and helpful manner.