knock the socks off someone
knock the socks off someoneINFORMAL
1. If something or someone knocks the socks off someone, they impress them. Stritch has been knocking the socks off Broadway audiences with her one-woman show. Note: You can also say that something or someone knocks your socks off. The next act is going to knock your socks off! Note: The verb blow is sometimes used instead of knock. This is the latest in screen technology and it will blow your socks off.
2. If something or someone knocks the socks off other people or things, they are much better than them. They're not cheap but they knock the socks off other models on the market. For personal service and value, they knock the socks off larger hotels.