| 释义 |
▪ I. overˈstep, n.
[f. the vb.]
1. An act of overstepping or passing beyond a limit.
1822–34Good's Study Med. (ed. 4) III. 64 This apparent overstep, be it what it may, in the march of insanity beyond that of the population of the country, is a real retrogression.
2. Geol. In an unconformity, the structural relationship between the lowest stratum of the upper series and the truncated ends of the underlying strata when, as is often the case, these have a different dip from the upper series (chiefly British).
1883A. J. J. Browne in Geol. Mag. Decade II. X. 336 Both cases involve an unconformity, and..the difference between them is really this: in overlap the basement member of the upper series has a limited extension, while in overstep the basement bed has a continuous extension... The unconformity between the two series will generally be much greater in the case of overlap than in the case of overstep, for in the latter the beds all dip in the same direction, and the existence of an unconformity is usually only made patent by the fact of overstep. 1937Q. Jrnl. Geol. Soc. XCIII. 120 In the two marginal parts of the Wealden trough..there is a definite overstep, due to the fact that while the freshwater Wealden beds were being deposited in the central subsiding area the margins of the trough were being gently uptilted. 1948Bull. Amer. Assoc. Petroleum Geologists XXXII. 2297 The word overstep..in more than 60 years of existence..has not succeeded in gaining any recognition among American geologists and very little in England. 1969Bennison & Wright Geol. Hist. Brit. Isles i. 10 In the case of any angular unconformity the lowest bed of a series of strata is seen to rest on beds of differing ages. Such a phenomenon is known as overstep, and the post-unconformity bed is said to overstep onto successively older beds.
▪ II. overˈstep, v.
[OE. ofersteppan, f. ofer- over- 5, 12; = OHG. ubarstephen, Du. overstappen.]
1. trans. To step over or across; to pass beyond or to the other side of (a boundary or thing material or immaterial). Also intr. to overstep the mark: see mark n.1 12 e; also ellipt.
a1000Lamb. Ps. xvii. 30 (Bosw.) Ic ofersteppe weall [transgrediar murum]. 1489Caxton Faytes of A. i. xii. 32 They ouerpresse and ouerstep one ouer that other. 1592Greene Philomela Wks. (Grosart) XI. 126, I will ouerstippe the conceit of mine own folly. 1871R. Ellis Catullus lxxxviii. 7 Infamy none o'ersteps, nor ventures any beyond it. 1875Bryce Holy Rom. Emp. xx. (ed. 5) 363 France..by the annexation of Piedmont, had overstepped the Alps. 1931W. Faulkner Sanctuary xvi. 118, I made a fire in the stove. I guess I over-stepped.
2. Geol. Of the upper strata of an unconformity: to extend over (underlying strata) in such a way as to form an overstep. Also intr. with on to. Chiefly British.
1883J. G. Goodchild in Geol. Mag. Decade II. X. 227, I have found it convenient..to speak of this stratigraphical relation of unconformable beds to the various rocks immediately beneath as Overstepping. For example, I should say that the Roman Fell Beds in the neighbourhood of Melmerby overlap the Upper Old Red, while the Carboniferous formation..oversteps the older rocks there. 1937Q. Jrnl. Geol. Soc. XCIII. 107 Some of the older records..seem to suggest that the Gault in East Sussex oversteps the Folkestone Sands within a short distance of their outcrop. 1938A. K. Wells Outl. Hist. Geol. ii. 12 In the diagram section the Cambrian rocks overstep the Pre-Cambrian, and higher divisions overlap lower ones. 1969[see overstep n. 2]. 1972Gloss. Geol. (Amer. Geol. Inst.) 507/1 An unconformable stratum that truncates the upturned edges of the underlying older rocks is said to ‘overstep’ each of them in turn (except where the stratum and the underlying beds have the same strike).
So overˈstepping vbl. n., spec. in Cricket, the action of bowling with either foot illegally positioned in relation to the creases.
1869Mill Subj. Women i. 32 An overstepping of the proper bounds of authority. 1959Oxford Mail 2 Feb. 8/7 Rorke..lost a lot of his fearsomeness after being rightly no-balled because of his long drag, called over-stepping in Australia. 1976J. Snow Cricket Rebel 98 Rowan reports remarks I am alleged to have made..after I had been no⁓balled for overstepping. |