pur ‧ loin /pɜːˈlɔɪn, ˈpɜːlɔɪn $ -ɜːr-/ BrE AmE verb [transitive]
[ Date: 1300-1400 ; Language: Anglo-French ; Origin: purloigner 'to put away, make useless' , from Old French porloigner 'to put off, delay' , from loing 'at a distance' ]
formal to obtain something without permission – often used humorously:
He must have purloined a key from somewhere.