like a knife through butter

Prepositional phrase

(simile) With great ease and effectiveness.

Japanese Meaning

非常に容易に、かつ効果的に進む様子 / 極めて簡単かつ効率的に物事が実行される状態

The experienced chef cut the roast like a knife through butter, impressing everyone at the table.

経験豊富な料理人はローストを難なく切り分け、食卓の皆を感心させた。

Sense（1）

(simile) With great ease and effectiveness.