submersion
n.
early 15c., "suffocation by being plunged into water," from Late Latin submersionem (nominative submersio) "a sinking, submerging," noun of action from past participle stem of submergere "to sink" (see submerge). General sense from early 17c.
〔李〕[sub-;mers;-ionn.] n.浸没，淹没 ←merg,mers (L mergere,mersum)=to sink 沉
〔蒋〕[merg=dip，sink沉，没(merg也作mers)，-ion名词后缀] 沉没，没入，浸没