You might have heard or read about M S Dhoni, India’s Cricket Captain, being described as a person who is as cool as a cucumber. The phrase ‘as cool as a cucumber’ is a figure of speech called a SIMILE and it means that M S Dhoni is a captain who does not get ruffled and always stays calm and relaxed - especially in a difficult situation. Actually, the coolness of cucumber is used to describe M S Dhoni’s state of mind when he is confronted with a difficult situation.
Similes are one type of what are known as figures of speech. Figures of speech are ways of expression resorted to by a writer or speaker to lay emphasis on their point of view in a more colourful way than simple grammar and vocabulary allow. There are many figures of speech and four of the important ones are simile, metaphor, hyperbole and personification.