L. Lat. In old English law. An estover; an allowance made to a person out of an estate, or other thing, for his or her support. An allowance of wood (in boscis) made to a tenant in dower for repairs, (ad ædificandum,) fuel, (ardendum,) and fencing, (claudendum). Bract. fol. 315. See Magna Charta, c. 7. An allowance of wood to a commoner, for similar purposes. Bract. fol. 222 b, 231. Fleta, lib. 4, c. 25. An allowance made to a man arrested for felony, for the support of himself and family during his imprisonment. Bract. fol. 136 b, 137. Fleta, lib. 1, c. 26, § 2. An allowance of forage to horses. Fleta, lib. 2, c. 73, § 3. The plural estoveria is used by more modern writers. Estoveria ædificandi, ardendi, arandi et claudendi; estovers of building, (house-bote,) burning, (fire-bote,) ploughing, (plough-bote,) and enclosing, (hedge-bote). Co. Litt. 41 b. See Stat. Westm. 2, c. 25. The doctrine of estoppels in pais is one which, so far at least as that term is concerned, has grown up chiefly within the last few years. But it is, and always was a familiar principle in the law of contracts. It lies at the foundation of morals, and is a cardinal point in the exposition of promises, that one shall be bound by the state of facts which he has induced another to act upon.estoveria, and more anciently estoverium; Redfield, C. J. 26 Vermont R. 366, 373. And see 2 Welsby, H. & Gordon, 653. ESTOPPEL, COLLATERAL. The collateral determination of a question by a court having general jurisdiction of the subject. See Small v. Haskins, 26 Vermont R. 209, 221. The whole subject of collateral estoppels is one of comparatively recent origin. And it is exclusively of the creation of the courts, and, like fictions of law,