Thanks- where do I go from here?

Thanks for helping out with 'get ones back up'... seems every week, my daughter has an assignment to find the meaning and origin of expressions/cliches. What are good resources to have on hand to look these up? I've found a few sites on the web, this being the best! Other ones we had to look up are 'faster than greased lightening' (Boston newspaper re: fast talker) and 'straight from the horses mouth' (supposed inner racetrack circles...) .

thanks again!
Vinnie