Do you think "tight-lipped" and "home-developed" have been used correctly in the following sentence? I think "tight-lipped" is used to describe the action of a person shutting his mouth, but does it mean "silent"? I haven't found the word "home-developed" in the dictionary. Do you think it could be understood by native speakers? Should I use "home-grown"? Any other problem with this sentence? However, he was tight-lipped about the home-developed TD-SCDMA service, which is due to start trials in October, saying only that the parent company, China Mobile Communications Corp, would be announcing details.