WordNet sense 1 (a form of rummy using two decks of cards and four jokers; jokers and deuces are wild; the object is to form groups of the same rank):

canasta, basket rummy

WordNet sense 2 (lose its distinct outline or shape; blend gradually):

melt

WordNet sense 3 (mix together different elements):

blend, coalesce, combine, commingle, conflate, flux, fuse, merge, mix, immix, combine