一切經音義 49.172

49.172

凹凸（上烏瓜反俗字形相正從穴窊或作窪亦同用也下田揑反亦俗字象形正作垤從土從姪省聲字也書云垤蟻封垤高起也）。

凹凸 [concave and convex] (The first character is w- + [g]ua [-> wa]. A vulgar character; it is pictographic. The orthodox form is composed with 穴 as 窊; sometimes written as 窪, also used interchangeably. The second character is t- + [n]ie [-> tu], entering tone. Also a vulgar pictographic character. The orthodox form is 垤, composed with 土 [earth] and phonetically abbreviated from 姪. The Book of Documents says: "垤 are ant mounds; 垤 means rising high").