lowball

card 1 of 7 · context meaning

What does 'lowball' mean in this sentence?

It may be, but it is worth noting that if the mortality rate is as low as 0.7% as some experts now hope rather than between 3 and 5% as the data suggests so far, that is still a lot of dead Americans. Californian health officials are bracing for a 56% infection rate. In New York, they are talking about a range of between 30% and 80%, so if we just lowball that, that is close to seven hundred thousand dead Americans as a result of COVID-19.