Definition of 'Tide'
A metaphor for a long-term market trend. The tide would refer to trends in the market that have long term affects, rather than short term changes that may reverse in a short period. Issues such as inflation, high unemployment and/or high interest rates, would affect an economy's tide.
Investopedia explains 'Tide'
The ocean metaphors for market trends were coined by one of the market's first technical analysts, Robert Rhea.
Tides are often referred to in the context of triple screen trading. Using this system, a trader uses a longer-term chart, or market tide, as the basis for trading decisions. For instance, if a trader plans to trade daily he or she would examine the weekly moving average convergence divergence (MACD) histogram, as its slope provides indication of the market tide.