under the weather
Under the weather (idiom) means Slightly ill or not feeling your usual self. Example: “I'm a bit under the weather today, so I'll join the meeting by phone.”
How to use under the weather
Learner’s notesIn plain EnglishFeeling a bit ill.
Informal but perfectly acceptable in workplace email; it is a polite way of not going into detail.
Use it with 'feel' or 'be'. Say 'I'm feeling under the weather', not 'I have under the weather'.
Trace the full origin ↓Fill the gap
Can you complete this real example?
I'm a bit _____ today, so I'll join the meeting by phone.
Etymology
From under the weather bow (“affected by bad weather; seasick”); weather bow is a nautical term referring to the side of a ship exposed to bad weather.