When two things merge, they come together, combine, or unite in some way.
When something emerges, it comes out or appears so that it can be seen.
An emergency is a sudden danger that needs to be taken care of right away, such as a flood or fire.
the combination of two or more commercial companies
the gradual beginning or coming forth
occurring unexpectedly and requiring urgent action
sink below the surface
sinking until covered completely with water
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