suffuse (v.)

"to overspread," as with a fluid or tincture, "fill or cover," as with something fluid, 1580s, from Latin suffusus, past participle of suffundere "overspread, pour beneath, pour upon," from sub "under" (see sub-) + fundere "to pour" (from nasalized form of PIE root *gheu- "to pour"). Related: Suffused; suffusing.