What's the difference between "lock" and "lock-up"?
Native speaker’s answer
Rebecca
"Lock" in this scenario means to fasten or secure something, such as a door or box, with a mechanism to keep it from being opened. Ex: He always locks his car when he parks it. Ex: I can't get inside. The door is locked. "Lock-up" has a couple of different meanings. One meaning is to imprison someone. Ex: He was locked up for stealing. Ex: She's been locked up for over thirty years for murder. Another meaning of "lock-up" means to lock or secure something. Ex: Remember to lock up before you leave. Ex: She locks up the store every night.