1. To lead one in the wrong direction; to cause one to be lost or in the wrong place. I'm afraid the GPS led us astray. We should have turned right back there. It was only when we saw the waterfall again that we realized our guide had been leading us astray.

2. To misdirect one into error. A few false positives led me astray at first, but I think I have a good idea of the data trends now.

3. To negatively influence one; to influence one to make poor choices. I just hope this new group that my son is hanging out with doesn't lead him astray.