同某人比赛、迎战的英文：
play against（someone）

play是什么意思：
v. 装扮；戏弄；参加；同…比赛；玩；打出；发挥作用；演奏；播放；扮演
n. 戏剧，剧本；比赛；玩耍，游戏

represent a play
再上演某剧

play around with
在一起厮混|玩弄|戏弄

Play havoc with
搅乱,破坏

against是什么意思：
prep. 与...相反；对...不利；倚靠；以防；以...为背景；和...相比

It is against federal law to discriminate against blacks.
歧视黑人是违反联邦法律的。

She was drugged against the pain.
她服麻醉药止痛。

He informed against the drugpusher.
他告发了那个毒品贩。

someone是什么意思：
pron. 有人，某人
n. 重要人物，有名气的人

Someone has tampered with the accounts of the company.
有人篡改了公司的账目。

Someone has tampered with the electrical circuits.
有人乱动过电路。

Someone left this for you.
有人把这留给你。