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low-water-mark

low-ˈwater-mark
  The line or level reached by the tide at low-water; a mark set up to indicate this. (Cf. high-water-mark.)

1526 in Dillon Customs of Pale (1892) 87 Anie wrak rivinge or drivinge in the sea without the Lowe water marke. 1629 H. C. Drayning Fennes C ij, When the out-fals shall bee opened to Low water marke. 1776 G. Semple Building in Water 2, 2 Inches above the Low-water Mark... 8 Inches above Low-water Mark. 1783 Page in Phil. Trans. LXXIV. 16 It continued in vast quantity almost to the spring tide low-water-mark. 1880 Geikie Phys. Geog. iii. §17. 154 The lower limit of the beach or low-water mark.

  b. fig. The lowest point reached in number, quality, quantity, intensity, etc.

1651 N. Bacon Disc. Govt. Eng. ii. xxxvii. (1739) 167 The state of Learning and Holiness was now at the low-water mark. 1745 H. Walpole Lett. (1846) II. 9 My ink is at low water-mark for all my acquaintance. 1838 Dickens O. Twist viii, I'm at low-water-mark myself—only one bob and a magpie. 1890 Spectator 29 Mar., Destroying the truths of which most social conventions are the low-water mark.

Oxford English Dictionary

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