The police officer hurried to the scene of the crime.
I sent thank you gifts express to the people who were nice to me.
Oh noooooo! The express train left. Now I'm going to be late. I’m really scared of being punished by Koichi.
Things that hurry and go faster than the other things are express. This is often used with trains or subways, so look out for it if you're looking to get somewhere in a hurry. Also be careful in case it doesn't stop at your stop, because 急行 trains don't stop at every station (which is what makes them express!).
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.