noun, noun or participle which takes 'suru', transitive verb
lock; fasten with a lock
General term for a physical lock or the act of locking something. Used as a noun or with する as a transitive verb.
自転車にロックをかけるのを忘れないで。
Don't forget to lock your bicycle.
ドアをロックしたか確認してください。
Please check if you locked the door.
noun
Refers specifically to the lock forward position in rugby union.
彼はラグビー部でロックを務めている。
He plays lock on the rugby team.