Things are looking up

The same as things are improving.

1) Elizabeth found a wonderful new job and just moved into a beautiful new apartment. Things are looking up for her.

2) Things are looking up with the economy.

Ref: A. Gillett - Speak English Like an American, 2004

That'll be the day!

You say that'll be the day when you think that something is very unlikely to happen.

a) Perhaps Mum and Dad will let us have a party in the house while they're away! That'll be the day!

b) Do you think your elder brother will lend us his car to go to the city? That'll be the day!

Referência: Everyday Idioms. Learners Publishing, 2004.

Tanto faz!

Um termo equivalente em inglês para Tanto faz! é I'm easy! . Em outras palavras, é uma expressão usada quando você está indiferente ao que foi sugerido.

a) Would you like tea or coffee? ~ I'm easy! You choose.
Você gostaria de chá ou de café? ~ Ah, tanto faz! Escolhe aí.

Tea or coffee?

Referência: Betty Kirkpatrick - Everyday Idioms. Learners Publishing, 2004.