To affirm to be correct, true, or genuine.
To certify in an official capacity.
To put under oath.
To supply or be evidence of.
To certify by signature or oath.
To believe (something is reasonable) and argue (for it); to advocate.
To be in opposition; to contest; to dispute; to vie; to quarrel; to fight.
To be in debate; to engage in discussion; to dispute; to argue.
To struggle or exert oneself to obtain or retain possession of, or to defend.
contend with: To try to cope with a difficulty or problem.