1 (wiktionary) 2 (vi.wikipedia) 3 (en.wikipedia) 4 (glosbe)

Core Words Familarize yourself with the 'core words'.
Compounds Expand your vocabulary by studying more complex words built by the 'core words'.
Wordsense Learn about the wordsenses of the english term.

ETYMOLOGY

KOREAN 3.0 Eng Wordtype Etym. Gb Vie
☆☆ BEING FOR A LONG TIME; BEING FOR A WHILE Noun 一度，一时，一阵子，长时间 một lúc lâu, một thời gian lâu
☆☆ LONG TIME; BEING A WHILE Noun 一阵，好一阵，好一会，老半天，大半天 một lúc lâu, một thời gian lâu