EUR USD 4 hour chart
This support line drawn across the chart is crucial. As you can see on the chart, it has support price action twice in the past month, leading to very good bounces off it. But wait here's more - look at the daily chart below and then you realize that this support level is really crucial. Any close below the line on a daily chart would mean that we would be looking for much more downside in coming days.
EUR USD Daily chart