The troops made a desperate 'last-ditch' effort to keep the town from being captured.
The negotiations were a 'last-ditch' attempt to prevent a labor strike.
His girlfriend 'ditched' him. = He 'got ditched' by his girlfriend.
(..) Outside it's living human tissue. Flesh, skin, hair, blood - grown for the cyborgs. - Look, Reese, I don't know... - Pay attention. I gotta ditch this car. The -Series had rubber skin. We spotted them easy. But these are new. They look human. Sweat, bad breath, everything. Very hard to spot. (..)1984 The Terminator
(..) But I couldn't take my eyes off you. I remember I snuck over to her and I said... - What did I say? - You said "What are you doin' after?" Right. So I ditch Roberta, we go for coffee, a month later we're married. years to the day after our first marriage. - I went through his pockets. - Marie, why? (..)1989 When Harry Met Sally...
(..) Okay. Blondie, stay here and baby-sit them two. White and Pink, take a car each. I'll follow you. You ditch 'em. Pick up the stones. While I'm followin' you, I'll arrange some sort of a doctor for our friend. You can't leave these guys here with him. (..)1992 Reservoir Dogs