Two people or things together; a pair or couple.(noun)
Sports A round of golf played by two people.(noun)
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 "twosome" in a sentence
"Word comes this morning that the twosome is touring Italy and you can follow them here as they eat their way across the country."
"The depressing aspect of this perpetual twosome is that it is so often based on sex and convenience."
"Because the essential ingredient for friendship is equality and there is always an imbalance when one person in the twosome is the parent of the other, mothers and daughters naturally can't be best friends."