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How do you turn it off?

You disable endorsements from appearing on your profile: http://help.linkedin.com/app/answers/detail/a_id/33198

What you can't do is prevent getting endorsements in the first place. LinkedIn will not let you disable receiving endorsements.

Yeah, I just ignore them.

Could someone confirm that this will still keep my existing endorsements just in case I want to show them again later?

Yes your endorsements are always there. You will continue receiving endorsements too. They just won't be displayed if you "disable" them.

Thanks.