('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']
(..) up to Reno and on to Truckee, just, rejoining the trail at a lower elevation. I didn't come out here to ride buses. You probably didn't come out here to slide off the side of a mountain, either. True. If you're worried about cheating yourself, just make your hike longer. (..)2014 Wild