slip of the tongue

US /slɪp əv ðə tʌŋ/
UK /slɪp əv ðə tʌŋ/
"slip of the tongue" picture
1.

口误, 说漏嘴

a minor mistake in speaking, usually unintentional, that reveals a hidden thought or feeling

:
It was just a slip of the tongue when I called him by the wrong name.
我叫错了他的名字,那只是个口误
She made a slip of the tongue and revealed the surprise party.
口误说漏了惊喜派对。