1. to open (transitive or intransitive)
2. (of ships, vehicles, troops etc) to start
3. to turn on; to put in operation; to operate; to run
4. to boil
5. to write out (a prescription, check, invoice etc)
6. (directional complement) away; off
7. carat (gold)
8. abbr. for Kelvin, 開爾文 Kāiěrwén
9. abbr. for 開本 kāiběn, book format

1. gun
2. firearm
3. rifle
4. spear
5. thing with shape or function similar to a gun
6. to substitute for another person in a test
7. to knock
8. classifier for rifle shots

classifiers: 支, 把, 桿, 條, 枝