deep
• adjective 1 extending far down or in from the top or surface. 2 extending a specified distance from the top, surface, or outer edge. 3 (of sound) low in pitch and full in tone; not shrill. 4 (of colour) dark and intense. 5 very intense, profound, or extreme: a deep sleep. 6 difficult to understand. 7 (in ball games) far down or across the field. • noun 1 (the deep) literary the sea. 2 (usu. deeps) a deep part of something, especially the sea. • adverb far down or in; deeply. — PHRASES go off the deep end informal give way immediately to an emotional or irrational outburst. in deep water informal in trouble or difficulty. jump (or be thrown) in at the deep end informal face a difficult problem or undertaking with little experience. — DERIVATIVES deepness noun. — ORIGIN Old English, related to DIP.
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