Lock bike.
Meaning: This means to make sure your bicycle is safe by attaching a lock to it. It's like saying, I always lock my bike when I get to school.
Choice of Words: Lock is a verb that means to secure something with a lock. Bike is a shortened form of bicycle, which is a two-wheeled vehicle that a person can ride. 'Lock bike' means to secure the bicycle using a lock.
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Related Expressions