Downtick and Low water

Downtick noun - A transaction in the stock market at a price below the price of the preceding transaction.

Low water and downtick are semantically related. In some cases you can use "Low water" instead a noun "Downtick".

Low water noun - The lowest (farthest) ebb of the tide.

Downtick and low water are semantically related. Sometimes you can use "Downtick" instead a noun phrase "Low water".