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air lock an airtight compartment in which the air pressure can be regulated, usu. situated between two areas that have different air pressures, as in underwater operations. [2 definitions]
combination lock a lock operated by turning a dial to a set series of numbers or letters.
lock out to make someone not able to enter a place.
lock step a way of marching extremely close together and precisely in unison so that marchers' legs do not collide with the legs of those in front of them. [2 definitions]
lock up to lock all the doors of a place or secure something with a lock.
locknut a thin nut screwed over another nut in order to stop it from coming loose. [2 definitions]
spring lock a lock in which a spring automatically shoots the bolt.
time lock a lock attached to a timing mechanism that prevents it from being opened until a specific time.
vapor lock a partial or complete interruption of the flow of liquid fuel in an internal combustion engine that is caused by the formation of bubbles of vapor or air in the fuel line.