What is the meaning of the word "bridge"?

Definitions:

something resembling a bridge in form or function noun
- The letters provided a bridge across the centuries.
the hard ridge that forms the upper part of the nose noun
- My glasses left marks on the bridge of my nose.
to connect or reduce the distance between verb
- The computer science class will bridge your understanding of these two fundamental skills.
to cross over on a bridge verb
- I bridged the river.
to make a bridge across something verb
- We bridged the river, using only bamboo and a wad of chewing gum.