I want to preface this by saying I am from Australia, so some of the phrases I use may not be used everywhere. If anyone from other countries wants to confirm that they are used where they come from, feel free. 1) I have never heard this used before, but I would easily understand what you meant if you were to use the phrase. 2) I am almost certain this is an Australian thing, but a lot of people say that something that has grown quickly has "shot right up." I have never heard "grows as mushrooms after the rain" but this is another thing I would easily understand if you were to use it. 3) You are correct there, in the case of poison or disease you are cured. Generally healing refers to mending injuries. It sounds a bit awkward to say that a doctor healed your flu for example. 4) A senseless life and a meaningless life mean pretty much the same thing depending on the context. For example "He lived a senseless life because he accomplished nothing" and "He lived a meaningless life because he accomplished nothing" would mean the same thing. 5) This makes sense, but if you use scientific terms it would be "It generates an electric current" 6) "But what is wrong with smoked chicken wings that are prepared by your owner every day?" The additional lines are all grammatically correct if you assume some context.