beats me

Phrase

as response or with indirect question idiomatic

(idiomatic, as response or with indirect question) I don't know; I have no idea.

Japanese Meaning

全く分からない / よく分からない

When they asked who ate the last slice of pizza, I shrugged and muttered, 'Beats me.'

誰が最後のピザの一切れを食べたのか聞かれたとき、私は肩をすくめて「さっぱり分からない」とつぶやいた。

Sense（1）

(idiomatic, as response or with indirect question) I don't know; I have no idea.

Do you have any idea what "tergiversate" means? Beats me!