| 释义 |
ground-line
[Cf. Du. grondlijn, G. and Sw. grundlinie (in senses 2 and 3).]
1. A line used for bottom-fishing. ? Obs.
a1450Fysshynge w. angle (1883) 22 Ye may angle to hym at all tymys with a grownde lyne. 1704Dict. Rust. s.v. Ground-angling, The Morning and Evening are the chiefest seasons for the ground Line for Trout.
2. Geom.
†a. The base upon which a diagram is constructed (obs.).
b. (See quot. 1857).
1551Recorde Pathw. Knowl. i. Defin., When one line lyeth flatte (whiche is named the ground line) and an other commeth downe on it, and is called a perpendiculer. 1571Digges Pantom. i. iii. C j, Measure out the like length in the perpendiculare..beginning from the ground line. 1659Willsford Scales Comm. 118 Let fall a Perpendicular..upon the Basis or ground-line. 1857W. Binns Treat. Orthogr. Project. i. (1862) 2 The vertical and horizontal planes are generally divided by a line called the ground line, or intersecting line of the two planes of projection.
3. pl. Outlines (lit. and fig.).
1624Wotton Archit. i. 65 Let no man..setle his Fancie vpon a draught of the Worke in paper..much less vpon a bare Plant thereof, as they call the Schiographia or Ground lines. 1858J. Martineau Stud. Chr. 150 We owe to the deeper Evangelical spirit..the ground-lines of an Ethical philosophy.
Add:4. Show-jumping. The line along the base of a fence formed where the obstacle meets the ground, and used in judging the point of take-off; hence, any marker placed to assist the horse and rider in this way.
1951M. P. Ansell Show Jumping i. 14 A fence, such as a wall, which rests on the ground, has a distinct ground line: a single rail has no ground line, making this obstacle difficult. 1986Riding May 30/2 For this we have a placing pole,..then a distance of 10 to 10½ yds to the second fence, which is a parallel with a bold groundline. |