1.drop in the bucket = I say drop in the ocean, meaning making a very small difference.
2.dry behind the ears = I say wet behind the ears, meaning inexperienced.
3.fly off the handle = get very angry
4.if and when = It means that you think it will happen and have decided how you will respond.
5.left holding the bag =
6.lock, stock, and barrel = completely
7.long arm of the law = justice has great pwers that can dig people out
8.look a gift horse in the mouth = be ungrateful about the quality of something you are given
9.skin of my teeth = very nearly- I escaped by the skin of my teeth.
10.tale of woe = woe is misery, unhappiness