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
☆☆☆ DOUBLE; TWO TIMES Noun 倍倍 gấp nhiều lần
☆ DOUBLE EYELID Noun 双 꺼풀 双眼皮 hai mí, mắt hai mí
☆ BEING DOUBLE; BEING TWO FOLD; TWO TIMES Noun 二重二重，双重 nhị trùng, sự gấp đôi, sự nhân đôi, đôi, hai