The idiom "on the drawing board" means that something is being planned or considered for future implementation. It suggests that the idea is still in its initial stages of development, and may not yet be finalized or fully formed.

The idiom "drop off" means to leave someone or something at a specific place, typically without staying to see if they are being picked up. It can also mean to discontinue doing something or to give up on an idea or plan.

The idiom "icing on the cake" means something that is an added bonus or a pleasant surprise, often making the original situation even better. It can also mean a small amount of something that makes a significant difference, like adding sugar to a dish.

The idiom "no spring chicken" refers to someone who is old or experienced, rather than being young or inexperienced. It suggests that the person has lived through many experiences and knows what they're talking about.

The idiom "take on" means to assume or undertake a responsibility, role, or task. It can also mean to become involved in a situation or to face a challenge. The figurative meaning of the idiom is similar to its literal meaning, but with an added sense of taking charge and being proactive.