Mining. A dislocation in a stratum; a fault (usually small).

Geology. A displacement in a stratum or series of strata caused by a fracture, with upheaval or subsidence of one or both parts; a fault.

A ‘fault’ in a seam of coal, also in a mineral vein or in any stratum; an up-throw or down-throw of the stratum (usually trap-up or trap-down). (Cf…

= trap, n.4; (also) the action or process of trap, v.3 (with down).

Geology. A slight fault or dislocation caused by the sinking of one section of the strata.

Geology. A fault or dislocation of strata.

Geology and Mining. A dislocation or break in continuity of the strata or vein. Also, a flaw or dislocation in ice. Cf. French faille.

Geology and Mining. A dislocation or displacement in a vein or stratum (cf. fault, n. 9a); spec. the vertical component of this. Also: the extent of…

figurative. A sudden abrupt rise in position, amount, price, value, or the like; an abrupt change of level either upward or downward; an abrupt…

U.S. A fault, a defect. Obsolete. rare.