expression, godan verb (-ru)
take a vote; call for ayes and noes
Fixed expression used in formal meeting contexts when the chair calls for a voice vote or show of hands to decide a matter.
議長は動議について可否を採った。
The chair took a vote on the motion.
採決 is the general noun for 'voting' or 'taking a vote', while 可否を採る is the specific procedural phrase used by a chairperson.
Compound of 可否 (yes or no; propriety) + を + 採る (to take; to gather). The phrase literally means 'to gather the yeses and noes'.