also: ふたつづつ
adverb, noun which may take the genitive case particle 'no', noun
two at a time; two by two; in twos
Indicates that something is done or distributed in groups of two. Can be used adverbially or with の to modify a noun.
子どもたちは二つずつお菓子をもらった。
The children received two sweets each.
二つずつのグループに分かれてください。
Please split into groups of two.