ground-line noun. ['graʊndlʌɪn] LME.
[from GROUND noun + LINE noun². Cf. Dutch grondlijn, German & Swedish grundlinie (in senses 2 and 3).]
1. A line used for bottom-fishing. Long rare or obsolete. LME.

2. a. Geometry. A line to which a perpendicular is drawn. M16-M17.
b. A line in a drawing, diagram, etc., that represents the ground or the horizon. M19.

3. In pl. Outlines, bases, foundations. E17.

4. The (actual or notional) line at the base of a jump from which a horse judges its take-off point. M20.

[TahlilGaran] English Dictionary ▲