high tide vs. low tide

high tide

noun

  1. the tide at its highest level of elevation.
  2. the time of high water.
  3. a culminating point:

    the high tide of the revolution.

low tide

noun

  1. the tide at the point of maximum ebb.
  2. the time of low water.
  3. the lowest point of decline of anything:

    His spirits were at low tide.