If a person has sallow skin, their skin, especially on their face, is a pale yellowish colour and looks unhealthy.
①She had lank hair and sallow skin.
②His face was sallow and shiny with sweat.
[scode type="green"]stumble across
If you stumble across something or stumble on it, you find it or discover it unexpectedly.
①I stumbled across an extremely simple but very exact method for understanding where my money went.
②History relates that they stumbled on a magnificent waterfall.