buff – n. a person who is very interested in something and who knows a lot about it

wild-goose chase – n. a foolish and hopeless pursuit of something unattainable.

eat out of house and home – idiomatic expression : to eat everything that someone has in the house

lie low – phrase keep out of sight; avoid detection or attention

It’s all Greek to me. – idiom : used to mean that you do not understand something

jealousy – n. an unhappy or angry feeling of wanting to have what someone else has

green-eyed monster – n. jealousy thought of as a monster that bites or attacks people

be-all and end-all  – n. the most important part of something or the reason for something
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