1 recede, flow back, subside, go out, go down; fall back or away, retreat, retrocede, retire:
The tide ebbed, leaving the boat stranded.
2 decline, flag, decay, wane, diminish, decrease, drop, slacken, fade (away), drain (away), dwindle, peter out, waste (away), deteriorate:
His enthusiasm for exercise is beginning to ebb.
3 low tide, low water, ebb tide, low point:
The rocks appear when the sea is at its ebb.
4 decline, decay, decrease, diminution, wane, drop, slackening (off), dwindling, lessening, deterioration, degeneration:
She was no longer willing to contend with the ebb and flow of his temper.