You must be new to the stock market. Have you ever heard of the flag/pennant chart pattern ?
This is a description, a stock makes a big percentage gain......on huge volume as compared to normal trading volume.......THEN.......consolidates the recent price rise on much lower volume than on the rise. What is happening is, there are many potential buyers on the sidelines awaiting......and hoping for a large pullback to happen, so the stock will trade in a reasonably tight trading range near the recent price rise, it could be a week, it could be three weeks.......it could be three days. Then when you look at a chart of that trading action......it will resemble a flag or a pennant, the day or days of the steep rise is the "flagplole" , then the consolidating in the days, or weeks will resemble the flag or pennant. All on low volume.......when the big pullback that the sideliners were waiting for does not happen.......they throw in the towel and come off the sidelines.......and cause the next leg up.