en.wiktionary.orgkhai tâm - Wiktionary, the free dictionary From Wiktionary, the free dictionary Sino-Vietnamese word from 開心, composed of 開 (“to open; to enlighten”) and 心 (“heart; mind”). (Hà Nội) IPA(key): [xaːj˧˧ təm˧˧] (Huế) IPA(key): [kʰaːj˧˧ təm˧˧] ~ [xaːj˧˧ təm˧˧] (Saigon) IPA(key): [kʰaːj˧˧ təm˧˧] ~ [xaːj˧˧ təm˧˧] khai tâm to begin teaching the alphabet (to children) (literary) to initiate; to enlighten vỡ lòng