A to B - get/go from A to B - to travel from one place to another place
A to Z, from - including all the facts about a subject
above all - most important (reason)
act, be a hard/tough act to follow - to be so good it is not likely that anyone or anything else that comes after will be as good
act, a balancing/juggling act - a difficult situation in which you try to achieve several different things at the same time
action, a piece/slice of the action, a - being involved in something successful that someone else started
after all - different from what you expected
all of a sudden - suddenly
apple, a bad/rotten apple - one bad person in a group of people who are good
apple of one’s eye, the - someone is favorite person, a well-loved person
armchair critic, an - someone who expresses opinions about thingsthey know very little about
as a matter of fact - in truth, really (often used to restate something more exactly)
as bald as a coot - to be completely bald having no hair on your head
as blind as a bat - not able to see well because of very bad eyesight
as busy as a bee - very busy
as fit as a fiddle - very healthy
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as funny as a barrel of monkeys - to be very funny or enjoyable
as good as gold - very good, well-behavedas happy as a lark - very happy
as hard as nails - very hard and cold, not forgiving
as hungry as a bear - very hungry
as plain as day - very easy to see or understand
-as quiet as a mouse - making almost no noise, being shy and not talking much
as regular as clockwork - always at the same time
as sharp as a tack - clever, intelligent 
as sick as a dog - very unwell -
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as weak as a kitten - not very strong
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as stubborn as a mule - not willing to change one's mind
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at first sight - after a quick look, before really thinking about one’s feeling about something
atmosphere, cut the atmosphere with a knife - something that you say to describe a situation in which everyone is feeling very angry or nervous and you feel that something unpleasant could soon happen
