Definition: to pay for an advertisement to be placed in a publication.
(This phrasal verb has more than one meaning)

E.g.1. They took a full-page advertisement out in 'The Times' newspaper.
E.g.2. Why did you tell him the secret? He's such a gossip - fewer people would have known about it if you'd taken out an ad in all the daily papers!

['ad' - informal version of 'advert' or 'advertisement']

Fonte: Knights English [daily@knightsenglish.com]