To organize or join a labor union.(verb-intransitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "unionize" in a sentence
"The best way to kill any movement to unionize, is to treat your workers well."
"Finally, although the right to unionize is constitutionally guaranteed, the interest in unionization also varies from region to region."
"WalMart’s fear that a Democratic President would allow employees to unionize is just more confirmation that Democrats look out for the American people while Republicans protect corporate profits. — bam"