Idioms are expressions. Existem thousands of idioms in English! Today vamos conhecer some more:
Peanut gallery = as últimas fileiras do theatre, cinema or classroom, where people talk too much.
E.g.: Não dê bola pra eles. They are the peanut gallery of the class.
Skeleton crew = A quantidade minimal of people para operar um business.
E.g.: Entre Christmas and New Year’s evening, só a skeleton crew vai work.
Skinny as a rail = very thin.
E.g.: He precisa eat more. He is skinny as a rail.