('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']
(..) The ball's in to deep right center! Davidson. over in the corner. cuts the ball oII! Here comes the throw. Richardson's around the dirt! He slides. he's in there. He's sate! It's a double! He's in there. Martini! Look at Richardson. he's on second base. Koutax is in big tucking trouble! (..)1975 One Flew Over the Cuckoo's Nest