Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you:
You have to remember the はし portion. Think of yourself running. It's nice. As you run, though, you notice the ground changing into something weird and mushy. Everything is turning into hash (はし) browns. You start to get sucked in, and soon you can't run anymore. Smell the hash browns and taste them too. What a terrible run this was.
I ran because I was almost late for the movie.
Koichi can run faster than a turtle.
I’ve come to the conclusion that having my head cut off by a samurai would be much better than running for my life.