Last Updated：2025/11/21

(informal, transitive) To ruin unintentionally. / (informal, Australia, intransitive) To clown around; to have fun, often at the expense of others.

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muck up

Source Word

muck up

Verb

informal transitive Australia intransitive

Japanese Meaning

うっかり台無しにする / ふざけ回る（時に他人の迷惑を顧みずに楽しむ）

I didn't mean to muck up the meeting by arriving late.

遅刻して会議を台無しにするつもりはなかった。

Sense（1）

(informal, transitive) To ruin unintentionally.

The terrorists have really mucked up our holiday plans.

Sense（2）

(informal, Australia, intransitive) To clown around; to have fun, often at the expense of others.

It's the last day of school and everyone is mucking up.

mucks up

（ present singular third-person ）

mucking up

（ participle present ）

mucked up

（ participle past ）

mucked up

（ past ）