Godan verb with 'mu' ending, Intransitive verb
to melt into; to dissolve into; to merge into
空が海と一つに溶け込むように見えた。The sky seemed to blend with the sea. to blend into (surroundings); to fit in; to adapt to; to integrate
Also written 融け込む【とけこむ】、解け込む【とけこむ】