('chiefly Brit') Her career has been 'on the slide' [='on the decline'] for a couple of years.
You were late this morning. I'll 'let it slide' this time, but don't let it happen again.
His parents are concerned that their son's grades have started to 'slide'. [='worsen']
(..) - You're invited. - Oh, thank you. Oh, yeah. - But we have a photographer, and he's taking the color shots and he's taking the slides and the set-ups, but my wife, the artistic one, she wants the black and white. Yes, we do. (..)2008 Two Lovers