The idiom “under the weather” signifies a mild illness or indisposition. For example, someone might say they are staying home from work because they are feeling unwell. It implies a general feeling of not being at one’s best, physically, without specifying a particular ailment. The phrase does not typically refer to serious illness.
This expression provides a polite and understated way to communicate feeling unwell. It avoids the need for detailed explanations or potentially embarrassing descriptions of symptoms. Its gentle and somewhat figurative nature makes it suitable for various social contexts, from casual conversations to professional settings. While the precise origin remains unclear, the phrase likely emerged from nautical terminology, possibly relating to the discomfort experienced by sailors during rough seas. Its continued use highlights its enduring practicality in everyday communication.