► 副詞とっくり  [(3)とっくり]    
meaning:  thorough  rank: 4☆ これは
重要な
点なのでとっくりと
理解する
必要がある ⇨ This is a very important point, so you need to understand thoroughly
► 名詞徳利  [とっくり]    
meaning:  bottle  rank: 4☆ 
彼は徳利の
酒を
盃に
注いだ ⇨ He poured sake into his cup from the tokkuri  
(☛ Japanese porcelain/ceramic carafes for sake)