What is U-lock?
1.
A heavy gauge metal lock used primarily for securing bicycles. The U-lock gets it's name from a 'U' shaped metal rod that has cutouts at each end to fit into a horizontal locking bar. This is considered to be one of the best bicycle locks.
My bike U-lock is heavy, but at least my bike won't get stolen.
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1.
It means, in a visual sense, to discern vaguely and incompletely due to distance or unclear atmosphere (fog, etc.) Figuratively it means..
