catch是“抓”，fire是“火”，catch fire含义是着火；起火；开始燃烧；激动人心；赢得成功。

【例句】
It was the dry season and everything was ready to catch fire.
这时正是旱季，什么东西都容易着火。

Phones do occasionally catch fire, with the causes not always being entirely obvious.
手机的确时不时地会着火，但是原因却不太清楚。