line drawn on water

Something transient or ephemeral. / An ill-defined or variable border between concepts or things.

日本語の意味

一時的で束の間のもの、儚い存在 / 概念や物事の間におけるあいまいで流動的な境界

He treated their promises like a line drawn on water, visible for a moment and gone with the tide.

彼は彼らの約束を、水面に一瞬描かれてはすぐに消える儚い線のように扱った。

意味（1）

Something transient or ephemeral.

意味（2）

An ill-defined or variable border between concepts or things.

The border between madness and mental balance is a line drawn on water.

lines drawn on water

（ plural ）