What does "support" mean here?

Question

This is a lagging indicator (most of them are) -- but a trend reversal in a major moving average grabs a lot of attention. So don't be a hero here; if support breaks down, take the money and run.

Answer 1

There are two levels to Stock swings, support and resistance. When it swings high, after certain high point there is resistance in the market to go up meaning there will be selling pressure along with short sales. This is called the 'resistence' level.
Similarly when the market swings low, after certain low point there is support in the market meaning, there will be buying in large lots. This is called the 'support' or support level. This is what is meant in your little excertpts.

Answer 2

Muncie gave a great answer. In the simplest terms, "support" is a psychological price level where the security in question should stop falling and make a bottom. If price action moves lower than that psychological level, ie, support level, then prices should continue down.

The second poster got into "resistence", which is the opposite, it is a psychological price level that the security in question should cease it's rally and make a top. If price breaks through that "resistence" level, then prices should continue to continue up.

If you look at a price chart with a moving average laid over it, you will notice that price action will tend to bounce off the moving average. For example, in a rallying market, when the price reverses down, the price will tend to fall to an area around the moving average and the reverse and continue to move to the upside again. The moving average is a great way to find where support and resistance is and excellent places to buy or sell depending if prices are rallying or falling. But, again, it's only a guideline, not a hard fast rule. Support/resistence levels only indicate where prices SHOULD reverse, not WILL reverse.

Answer 3

In this context, they are discussing the technical indicators for the stock in question. A trend reversal here means the stock has fallen below the 50 day or perhaps 200 day moving average. For short term traders the moving average might be 5 day, 13 day, 20 day, and 50 day. The 50 day moving average is watched by many many technical market people. When the price of the stock fall below the moving average, that is a sign that support for the stock "accumulation" is failing and there is a very good chance the stock will fall future as technical market traders take note that the stock has fallen below the average and start liquidating positions and even short selling. "Support" here means buyers of the stock are now becoming sellers. The technical market traders are self fulfilling prophesies.