Từ điển Hán Nôm

(1) combined ideogram (one of the Six Methods 六書|六书[liu4 shu1] of forming Chinese characters)
(2) Chinese character that combines the meanings of existing elements
(3) also known as joint ideogram or associative compounds
(4) to comprehend without being told explicitly
(5) to cotton on
(6) knowing (smile, glance etc)