conundrum = a puzzle 수수께끼
What to do about the dirty dishes piling up in the sink was a conundrum that the four roommates could not even begin to solve.
English grammar was a conundrum to Marcia, she just couldn't figure out how to put two words together.
corrugated = shaped with folds or waves 주름진
corrugated sheet metal is sheet metal that has been shaped so that it has ridges and valleys, like a ridged potato chip. Corduroy pants could be said to be corrugated. Much of the paperboard used in making cardboard cartons is corrugated.
Coterie = a group of close associates 동아리
The visiting poet-in-residence quickly developed a large coterie of student admirers, all of whom hoped that the visitor would to help them find publishers for their poems.
If you weren't a part of <ary's coterie, then you weren't anybody at all, in the opinion of Mary.
Cower = to shrink away or huddle up in fear 움추리다
The sound of her boss's footsteps in the hallway made Lizzie cower behind her desk like a wounded animal.
When Arnie turned on the lights, he found the children cowering behind the couch, the movie on TV had scared the wits out of them.
In the morning, the children found their new puppy cowering in the corner of his box, afraid of his new environment.