Most of the songs on Hello are about Poe's frustration with trying to reconnect with people. This song is no different. You've heard the term "Burning bridges" referring to the idea that you, although you might have lost communication with someone, you don't want to upset them to the point that they won't ever talk to you again. In "Dolphin", the bridge that Poe had to someone has fallen down. Not letting them stop her, she is going to try another way to reach this person. If the bridge has fallen, swim across!
Most of the songs on Hello are about Poe's frustration with trying to reconnect with people. This song is no different. You've heard the term "Burning bridges" referring to the idea that you, although you might have lost communication with someone, you don't want to upset them to the point that they won't ever talk to you again. In "Dolphin", the bridge that Poe had to someone has fallen down. Not letting them stop her, she is going to try another way to reach this person. If the bridge has fallen, swim across!