Definition
Lying by describes the conduct of a person who, by being present and remaining silent during a transaction that affects their legal interests, is treated as having acquiesced in that transaction. A party who has been "lying by" is subsequently barred from challenging the arrangement they silently witnessed. The doctrine is an application of equitable estoppel: the law will not permit a person to stand by, allow others to act on the assumption that no objection exists, and then step forward to disturb the settled expectations that silence created.
Common Language
Modern common usage (Wiktionary): Present participle and gerund of "lie by" — to rest, remain idle, or stay near something.
Historical common usage (Webster's 1913): To lie near or alongside; to rest; to remain inactive.
The ordinary sense of "lying by" suggests mere passivity or proximity with no legal consequence. The legal meaning is narrower and more consequential: it is not simply that the person was present and inactive, but that their presence and silence in a legally significant transaction is held against them as implied consent. The common meaning carries no such estoppel consequence.
Common Confusion
Lying by is closely related to, but distinct from, laches. Laches concerns delay in asserting a right over time, without requiring presence at the original transaction. Lying by is more specific: it applies when the party was actually present at the moment the transaction occurred and said nothing, making the inference of acquiescence more immediate and direct. The two doctrines can overlap — a person who lies by and then further delays may face both objections — but they are analytically separate grounds for equitable bar.
Lying by should also be distinguished from ratification, which requires an affirmative act or communication of approval. Lying by operates on silence and presence alone.
Why It Matters in Research
This term appears rarely in modern legal writing but surfaces consistently in older equity practice, particularly in cases involving conveyances, boundary disputes, partnership arrangements, and family settlements where affected parties were present at the negotiating table but raised no contemporaneous objection. Researchers working in nineteenth-century equity reports or early American chancery records will encounter it as a recognized ground for defeating a complainant's claim.
The truncated first-edition Black's entry (which appears to be cut mid-sentence in the source material) is a known artifact of the 1891 print edition; the second edition provides the complete formulation and should be treated as authoritative for the historical definition.
In the Law Mind corpus, lying by functions as a doctrinal node connecting estoppel, acquiescence, and equitable bar. A search for lying by in isolation will return limited results; researchers should cross-search under acquiescence by silence, estoppel in pais, and equitable estoppel to recover the full body of relevant material. The concept persists in modern law under those labels even though the phrase "lying by" has largely dropped from contemporary usage.
Historical Dictionary Support
Both editions of Black's are in agreement on the substance. The second edition is more complete: "A person who, by his presence and silence at a transaction which affects his interests, may be fairly supposed to acquiesce in it, if he afterwards propose to disturb the arrangement, is said to be prevented from doing so by reason that he has been lying by." This formulation cleanly identifies the three operative elements — presence, silence, and subsequent challenge — and grounds the bar in reasonable inference of acquiescence rather than actual consent.
Neither edition cites specific cases to anchor the doctrine, which is consistent with lying by being treated as a well-settled equitable principle rather than a term requiring independent authority. The reference in the first edition to Taylor's Civil Law ("Tayl. Civil Law, 39") suggests the concept has roots in civilian equitable reasoning imported into common law equity practice, though the fragment is too incomplete to draw firm conclusions.
Modern legal dictionaries have largely absorbed this concept into the broader estoppel and acquiescence entries without preserving "lying by" as a standalone term. Researchers should not expect to find it indexed in post-mid-twentieth-century secondary sources.
Jurisdictional Note
Because lying by is a doctrine of equity rather than statute, its application varies with the equitable traditions of individual jurisdictions. Courts in jurisdictions that merged law and equity early may treat it as a subspecies of equitable estoppel without using the phrase at all.