conjunction
what's more; moreover; at that
Adds an additional, often emphatic, point to a preceding statement. Can introduce a positive or negative addition.
彼は頭がいい。それも、努力家だ。
He is smart. What's more, he is a hard worker.
雨が降ってきた。それも、ひどい土砂降りだ。
It started raining. And at that, it's a heavy downpour.
conjunction
Used to introduce a contrasting or unexpected statement after a preceding one. Similar to それなのに or それでも.
彼はとても忙しい。それも、毎日ジムに通っている。
He is very busy. And yet, he goes to the gym every day.