two or three at a time; in small numbers People arrived in twos and threes.
in twos and threesjump to other results
reading, writing, and arithmetic, thought to be the most important parts of a child's education
the three Rs(old-fashioned)jump to other results
used to suggest that it is better to be in a group of only two people than have a third person with you as well
two's company (, three's a crowd)(saying)jump to other results