すいめん
すいめん 【水面 】the surface of the water .▸ 潜水艦が水面に浮上した A submarine came up to the surface .⦅やや書 ⦆A submarine surfaced .▸ 油が水面に浮かんでいる There's some oil floating on the water .水面下 ▸ 水面下の ⦅見えないところでの ⦆折衝 〘conduct 〙 negotiations in secret [behind the scenes ] / secret [behind-the-scenes ] negotiations .