Not up to snuff and Under the weather

Under the weather and not up to snuff are semantically related. In some cases you can use "Under the weather" instead an adjective phrase "Not up to snuff".

Under the weather adjective - Somewhat ill or prone to illness.

Not up to snuff and under the weather are semantically related. Sometimes you can use "Not up to snuff" instead an adjective phrase "Under the weather". informal substitute