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v.
defend, explain, clear away, or make excuses for by reasoning; "rationalize the child's seemingly crazy behavior"; "he rationalized his lack of success"
v.
be engaged in a fight; carry on a fight; "the tribesmen fought each other"; "Siblings are always fighting"; "Militant groups are contending for control of the country"
v.
report or maintain; "He alleged that he was the victim of a crime"; "He said it was too late to intervene in the war"; "The registrar says that I owe the school money"
v.
be in accord; be in agreement; "We agreed on the terms of the settlement"; "I can't agree with you!"; "I hold with those who say life is sacred"; "Both philosophers concord on this point"
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"