What does ebb mean?

IMG_0006
ebb
ɛb/
noun
noun: ebb
  1. 1.
    the movement of the tide out to sea.
    “the tide was on the ebb
    synonyms: receding, going out, flowing back, retreat, retreating, drawing back,abating, subsiding;

    rare retrocession
    “the rocks were revealed by the ebb of the tide”
verb
verb: ebb; 3rd person present: ebbs; past tense: ebbed; past participle: ebbed; gerund or present participle: ebbing
  1. 1.
    (of tidewater) move away from the land; recede.
    “the tide began to ebb”
    synonyms: recede, go out, retreat, flow back, draw back, fall back, fall away,abate, subside;

    “the tide ebbed in the afternoon”
    antonyms: come in
  2. 2.
    (of an emotion or quality) gradually decrease.
    “my enthusiasm was ebbing away
    synonyms: diminish, dwindle, wane, fade away, melt away, peter out, decline, die away, die down, die out, flag, let up, lessen, decrease, weaken,dissolve, disappear, come to an end; More

Origin
Old English ebba (noun), ebbian (verb), of West Germanic origin; related to Dutch ebbe(noun), ebben (verb), and ultimately to of which had the primary sense ‘away from’.