The idiom "curiosity killed the cat" is a figurative expression that means an innocent person or thing may be harmed because someone has become too curious or inquisitive about it.

The idiom "greenhorn" refers to someone who is new or inexperienced, particularly when it comes to a certain activity or situation. It can also refer to someone who is naive or gullible.

The idiom "in stitches" means to be very happy, pleased or delighted with something. It can also mean being utterly amused by a situation or someone's behavior.

The idiom "viper in the bosom" refers to a person or thing that appears harmless or trustworthy but is secretly dangerous, treacherous, or deceitful. It suggests that the person or thing is hiding something harmful or harmful intent and can strike at any time without warning.

The idiom "walk out on" means to leave or abandon a situation or person suddenly, without any warning or explanation. It can also mean to reject or turn down an offer or proposal.