Meaning in Plain English

To feel under the weather is to feel unwell, tired, or slightly ill. It usually describes minor illness — a cold, a headache, an off day — rather than a serious condition.

  • I’m feeling a bit under the weather, so I’ll work from home.
  • She called in sick; she’s been under the weather since Tuesday.

The phrase is informal and polite, which is why people use it for work absences and social cancellations. It says the person is not well without specifying symptoms. This page is about the phrase’s history; the modern meaning is the same on both pages of this library.

The Documented Chronology

The dated record is clearer than the popular story suggests. Etymonline summarizes the evidence this way:

  • 1803. A Philadelphia newspaper (the Philadelphia Aurora, June 17) uses the phrase in the sense of being in difficulties — “perhaps originally ‘held in jail.’”
  • 1810. The sense of being indisposed or unwell is recorded by 1810.
  • The “in difficulties” sense came first; the illness sense followed and eventually became dominant.

So the phrase is documented in American English from the early nineteenth century, and its earliest recorded sense was trouble or difficulty, not sickness. The narrowing to “unwell” happened over the following decades.

The Nautical Story: Plausible but Not the Documented Origin

The popular explanation says the phrase comes from sailing ships: sailors who felt ill were sent below deck, “under the weather deck,” to recover. It is an easy story to repeat — and it may contain a grain of truth — but the printed record does not support it as the origin:

  • Etymonline describes the phrase as “colloquial, apparently regarded as a sailor’s term.” The sailing connection is an early association, not a demonstrated first use.
  • The documented nautical phrase points the other way: in nautical language, under the weather shore meant a sheltered anchorage — the side where the water was smoother. That is the opposite of the popular story’s picture of exposure and seasickness.
  • No dated source shows the phrase beginning as a description of sick sailors sent below deck. That version appears in later popular retellings.

The honest label is plausible but unproven: the phrase had nautical associations early, but the specific “below the weather deck” origin story is not documented. It should be told as a theory, not as the origin.

How the Meaning Shifted

In the early 1800s the phrase meant being in trouble or difficulty (including, apparently, being held in jail). By the 1810s it was used for being indisposed, and over the nineteenth century the illness sense took over. That is a common pattern: a vague phrase about hardship narrows to a specific, useful meaning. The phrase also became more common in American than British English, which fits its documented American beginnings.

  • Off-color / off-colour — feeling slightly unwell.
  • Under the weather vs. under the weather shore — the nautical term for sheltered anchorage; related in vocabulary, different in meaning.
  • Peakish / peaking — older informal words for looking unwell.
  • Seedy — British informal for feeling unwell.

Quick Questions

Did the phrase come from sailors?

The phrase had early nautical associations, but the specific story of sick sailors being sent below the weather deck is not documented. The printed record shows the phrase in American English by 1803–1810, first meaning difficulties, then illness.

Is “under the weather” American or British in origin?

The earliest documented examples are American (Philadelphia, 1803). The phrase later became common in both varieties.

Does the phrase always mean sick?

Today, almost always. In the early 1800s it could mean being in difficulties more generally; the illness sense gradually became the only common one.

Sources and Further Reading