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v.
work together on a common enterprise of project; "The soprano and the pianist did not get together very well"; "We joined forces with another research group"
v.
be in direct physical contact with; make contact; "The two buildings touch"; "Their hands touched"; "The wire must not contact the metal cover"; "The surfaces contact at this point"
v.
discontinue an association or relation; go different ways; "The business partners broke over a tax question"; "The couple separated after 25 years of marriage"; "My friend and I split up"