close a sale

[Wookie]

"We don't close a sale, we open a relationship."

From the context, I assume that it has nothing to do with the meaning related "shutting down".
What does "close a sale" mean?

[Anglika]

We close a sale = we complete a sale.

This sentence, which must be from an advertisement, is saying that the advertiser cares about his customers and that each time a sale is made, so a personal connection is made.

[CassiaGreco]

Just to add some extra help, this English idiom can also be found with "deal" instead of "close". In both cases the meaning is 'to complete a sale to a customer'. And if you know someone really good at closing deals, this person is a "good closer". Regards to you all.