1. ´Level off´ significa ‘estabilizar’

Meaning: if a rate or amount levels off, it stops rising or falling and stays at the same level

Ex:

1. Book sales increased until December 2021 – after that the sales levelled off?
– As vendas dos livros aumentaram até dezembro de 2021 – depois disso, as vendas se estabilizaram.

2. House prices have levelled off after the sharp increase in prices last year.

– Os preços das casas se estabilizaram após o aumento no ano passado.

2. ‘ Step up’ significa ‘aumentar ou intensificar’

Meaning: to increase the size, amount or speed of process OR to intensify

Ex:

1. We are stepping up the production to meet the increased demand at Christmas.
– Estamos aumentando a produção para atender à demanda crescente no Natal.

2. The Police have stepped up the security for the World Cup match.

– A polícia intensificou a segurança para o jogo da Copa do Mundo.