The idiom "drop a bombshell" refers to making an unexpected or significant announcement that has a profound impact on the listeners, usually causing shock or disbelief. It can also mean revealing confidential information or a surprise attack.

The idiom "last but not least" is used to describe someone or something that comes second to last, but it does not mean they are inferior or unimportant. In fact, the phrase can be used to emphasize the importance of what follows, as if the final item is the most significant.

"Doubting Thomas" is an idiom that refers to someone who refuses to believe something until they have seen it for themselves, even if others have already witnessed or experienced it. It implies skepticism and a reluctance to accept information on faith or without concrete evidence.

The idiom "prone to" means more likely or inclined to do something, especially something negative or harmful. It describes a person who is susceptible to certain conditions, diseases, or circumstances that may affect their health or wellbeing.

"Under fire" is an idiomatic expression that means to be in a difficult or challenging situation, often involving criticism or opposition from others. The phrase can also refer to being under attack or facing adversity in general.