On Thursday, Petit made another cup for crewmate Stephen Bowen and proposed a toast to the Thanksgiving holiday, space exploration and "just because we're in space and we can."
Could you please explain to me what "propose a toast" means here?
Source :
http://www.smh.com.au/news/technology/zerogravity-cup-means-no-more-straws/2008/11/28/1227491791137.html