'Ditch' = abandon (do not use).
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soheil1'chat up' is only mentioned as a phrasal verb:I would have used a hyphen: "chat-up lines", making it an adjective.
soheil1Never heared of an adjecctive made out of a verb!It happens all the time. You sit down to a sit-down dinner. You drive in to a drive-in movie (well, I used to). You iron on an iron-on patch.