Phono-semantic compound:
欠 (흠, “to yawn, lack”) – gives the meaning;
二 (이, “two”) – gives the sound.
Originally meant “at one’s own discretion”, but that sense was borrowed by 恣 (자 – to act willfully, to be self-indulgent).
It appears in words like 次元 (차원, “dimension”), 차례 (次例, order), and 순차 (順次, sequentially).
Characters with 次 as their phonetic element are generally read as 자 in Korean:
資 (재물 자) – wealth
姿 (모양 자) – appearance
恣 (마음대로 자) – willfully, self-indulgent
瓷 (사기그릇 자) – porcelain