low-down
1. adjective (used prenominally) Dishonest or unfair; vile or despicable; contemptible. The guy I've been seeing turned out to be a low-down, cheating rat! You're nothing but a low-down coward, you know that? My low-down boss fired me, even though it was his mistake that lost us the client!
2. noun The truth, facts, or most pertinent information about something. OK, here's the low-down: I've got a great business opportunity lined up, but I need to borrow a few thousand dollars to get it off the ground. This is Jane—she'll give you the low-down on day-to-day tasks around the office.