a bang for the buck

a Determinative

— A is used when the following word could be any of a certain type. Compare "A book I saw on the shelf" and "The book I gave you yesterday".

a Noun

— A is the first letter of the alphabet. The letter "a" comes before "b". — In some schools, an A is a very high grade. Ron got an A on his earth science test.

bang Noun

— A bang is a short loud noise like the sound of a door closing or a gun being shot. The two cars hit with a big bang.

for Preposition

— shows that something belongs to something else, or has a specific function This cake is for you. This is a net for catching fish. — For is used to show the reason for something He was angry, for he had never been called such terrible names before.

for Subordinator

— For introduces a clause with a subject and a to-infinitive It's not good for you to be too relaxed.

the Determiner

— Used, instead of a, to reference something specific, already known to exist. Compare "I read a book." and "I read the book." — Used with a stress, to show that the word following is special. Are you the John Smith that I went to school with? — Used with an adjective that acts like a noun to mean all of the people concerned The poor are always with us. — Used with superlatives forms of adjectives and adverbs. You are the best.

buck Noun

— A male deer or goat. — A male rabbit or hare. — A male of another animal, such as the ferret. — A dollar. — Blame The buck stops here. - Harry S. Truman, an American president

buck Verb

— If an animal bucks, it tried to throw a person off its back.