Answer:
The answer for number 1 is idiom, and for numbers 2 and 3 is euphemism.
Explanation:
An idiom is a sentence whose meaning cannot be inferred from the literal meanings of each word. For instance, the idiom "to be under the weather" means to be ill or unwell. In number 1, "He's an eager beaver" is an idiom to refer to someone who is enthusiastic, who works hard and excitedly.
Number 2 provides us with the definition of euphemism. Euphemism is the action of using substitute words to say something in a less unpleasant manner. Then number 3 provides us with an example of euphemism. Instead of saying the offensive words "That person is totally obnoxious", we may choose to say "That person is kind of excited". We won't sound too rude or aggressive when we use the euphemism.
