What is the Meaning of the Idiom
UNDER THE WEATHER?
ill, or unwell
Typically this suggests a general feeling of discomfort, rather than specific pain such as a headache or vomiting.
It is almost almost used with the verb to feel.
1. I think I might be getting the flu. I have been feeling under the weather all morning.
2. If you don’t mind, I think I’ll stay home tonight. I’m feeling a little under the weather and I would like to go to bed early.
3. A: Where’s John this morning?
B: He drank a lot at the party last night! He is probably feeling under the weather this morning!