Definition
"Rainy day" is an idiomatic phrase occasionally appearing in legal instruments — most commonly wills, trusts, deeds of gift, and savings or reserve fund provisions — where a testator, settlor, or drafting party uses the term to describe a future contingency of financial hardship or personal adversity. When a document directs that funds be held or distributed "for a rainy day" or "against a rainy day," courts must determine what triggering condition the drafter intended. Because the phrase has no fixed legal meaning, its interpretation is entirely contextual: it may refer to general economic need, a specific category of hardship (illness, unemployment, loss of income), or simply a prudential reserve with no defined trigger at all.
In modern statutory usage, "rainy day fund" has become a term of art in state budget law, referring to a budget stabilization reserve maintained by a government to offset revenue shortfalls in economic downturns. This statutory usage is more precise than the phrase's appearance in private instruments, though even here the governing statute or appropriations rule controls rather than any general legal definition.
Common Language
Modern common usage (Wiktionary): A difficult period of need; a time when money will be needed. Also used literally to mean a day on which it rains.
Historical common usage (Webster's 1913 / Worcester): "Rainy" means abounding in rain; showery; wet. The phrase carried its idiomatic financial meaning in popular speech but without technical precision.
The gap matters for legal research: In ordinary speech, "rainy day" communicates a recognizable idea about prudence and future need, and most people would have no trouble understanding a neighbor's intent. In legal instruments, however, that intuitive shared understanding is precisely what courts are asked to reconstruct — and the phrase's deliberate vagueness can become a source of litigation when beneficiaries and trustees disagree about what conditions qualify. The legal problem is not that the phrase is obscure but that it is too familiar: drafters rely on its common-sense meaning without defining it, and courts are left to supply content the instrument omits.
Why It Matters in Research
The primary research challenge with "rainy day" in legal sources is that it almost never appears as a term of art in reported case law outside of two contexts: (1) construction of private instruments (wills, trusts, deeds) where the phrase was used loosely by a non-lawyer drafter, and (2) state budget and fiscal law, where the phrase has been operationalized by statute into "rainy day fund" or "budget stabilization fund" provisions.
Researchers working in estate and trust law should treat "rainy day" as a term requiring intent evidence rather than doctrinal definition. The controlling question is what the particular testator or settlor meant, not what the phrase means in the abstract. Cases construing the phrase will generally be decided on the instrument's surrounding language, the drafter's circumstances, and extrinsic evidence of intent where admissible. Do not expect precedent from one jurisdiction to transfer cleanly to another.
Researchers in state fiscal law face a different landscape. By the early twenty-first century, most U.S. states had enacted statutes creating formal reserve funds under names including "rainy day fund," "budget stabilization fund," or "emergency reserve fund." The governing rules — deposit triggers, withdrawal conditions, replenishment schedules — are entirely statutory and vary significantly by state. The idiomatic phrase has here been converted into a defined statutory concept, but the definition is the state legislature's, not a general legal one.
Researchers using historical sources should note that Bouvier's candid observation — that the phrase "has no definite and certain meaning" — remains accurate and should be treated as a warning against importing any single historical usage into modern documents. The phrase's indeterminacy is not a deficiency of older dictionaries; it is intrinsic to the term.
Historical Dictionary Support
Bouvier's Law Dictionary is unusually direct on this entry, acknowledging that "rainy day" has no definite and certain meaning and may be understood in many senses. Bouvier cites both Worcester and Webster for the meteorological base meaning ("abounding in rain; showery; wet") while recognizing that the legal significance of the phrase depends entirely on how it is used in context. This is one of the few instances where a major historical law dictionary essentially declines to define a phrase and instead flags its indeterminacy — a candid and accurate editorial judgment that should guide modern researchers.
What Bouvier does not address, because it postdates his era, is the modern statutory development of "rainy day fund" as a budget law concept. Researchers should not read the historical dictionary treatment as exhausting the term's current relevance; it captures only the private-instrument construction problem and says nothing about fiscal law.
Jurisdictional Note
In the context of private instruments, jurisdictional variation tracks general trust and will construction doctrine — meaning the governing law of the instrument controls, and results will differ. In the budget law context, variation is significant and state-specific: each state's rainy day fund operates under its own statutory framework, with different caps, triggers, and withdrawal conditions.