simple past tense and past participle of merge
"The two companies merged last year to form a larger corporation."
In plain English: When two things are merged, they have been combined into one single thing.
"The two rivers merged into a single, wider stream before reaching the ocean."
formed or united into a whole
"The two small rivers merged to form a single, wide stream before reaching the ocean."
joined by merging
"The two rivers merged into a single, wide channel before reaching the ocean."