► 動詞使い込む  [(4)つかいこむ]    
meaning:  steal  rank: 3☆ 
彼は
会社の
金を使い
込んだ ⇨ He (stole and) used company money  
(☛ Steal money and use it for personal gain)使い込む  [(4)つかいこむ]    
meaning:  use  rank: 3☆ 
彼の
ギターは使い込まれている ⇨ His guitar is very well used (and show signs of wear and tear)