evanesce
v.
"vanish by degrees, melt into thin air," 1817, a back-formation from evanescence, or else from Latin evanescere "to pass away, vanish" (see evanescent).
〔李〕v. 渐渐消失 [van =empty] ←-esce [L] 表示“开始…；产生…”
〔蒋〕[e-表示out，van空，无→消失，-esce动词后缀，表示逐渐成为…] 逐渐消失，消散，消失