This is the 7472nd most frequent Dutch word.
bruggetje
A small bridge.
In this case, 'bruggetje' is used in a literal sense to indicate a small bridge.
Het bruggetje over de sloot is erg smal.
The small bridge over the ditch is very narrow.
Here, 'bruggetje' is metaphorically used to describe a transition or segue between topics.
Tijdens zijn toespraak maakte hij een mooi bruggetje naar het volgende onderwerp.
During his talk, he made a smooth transition to the next topic.
This use of 'bruggetje' again refers literally to a small, physical bridge.