01 a. Extending far below the surface; of great perpendicular dimension (measured from the surface downward, and distinguished from high, which i…
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1.
Extending far below the surface; of great perpendicular dimension (measured from the surface downward, and distinguished from high, which is measured upward); far to the bottom; having a certain depth; as, a deep sea.“The water where the brook is deep.” — Shak.
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2.
Extending far back from the front or outer part; of great horizontal dimension (measured backward from the front or nearer part, mouth, etc.); as, a deep cave or recess or wound; a gallery ten seats deep; a company of soldiers six files deep.“Shadowing squadrons deep.” — Milton.“Safely in harbor Is the king's ship in the deep nook.” — Shak.
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3.
Low in situation; lying far below the general surface; as, a deep valley.
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4.
Hard to penetrate or comprehend; profound; -- opposed to shallow or superficial; intricate; mysterious; not obvious; obscure; as, a deep subject or plot.“Speculations high or deep.” — Milton.“A question deep almost as the mystery of life.” — De Quincey.“O Lord, . . . thy thoughts are very deep.” — Ps. xcii. 5.
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5.
Of penetrating or far-reaching intellect; not superficial; thoroughly skilled; sagacious; cunning.“Deep clerks she dumbs.” — Shak.
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6.
Profound; thorough; complete; unmixed; intense; heavy; heartfelt; as, deep distress; deep melancholy; deep horror.“An attitude of deep respect.” — Motley.
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7.
Strongly colored; dark; intense; not light or thin; as, deep blue or crimson.
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8.
Of low tone; full-toned; not high or sharp; grave; heavy.“The bass of heaven's deep organ.” — Milton.
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9.
Muddy; boggy; sandy; -- said of roads.“The ways in that vale were very deep.” — Clarendon.
Phrases & compounds
A deep line of operations —
a long line.
Deep mourning —
mourning complete and strongly marked, the garments being not only all black, but also composed of lusterless materials and of such fashion as is identified with mourning garments.