To acquire the basic knowledge and skills necessary to perform a job or participate in an activity effectively.
Like 'show the ropes,' this phrase comes from maritime tradition where sailors had to master the intricate rope and rigging systems aboard ships. Learning which rope did what was essential for survival and effective seamanship in the age of sail.
The phrase perfectly captures how learning any new skill involves understanding both the obvious and subtle connections - just as ship ropes formed an interconnected system where pulling one could affect several others. Modern rock climbing has kept this literal meaning alive!
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