さん さん
sansangogo

Adverb

1. in groups of twos and threes; in small groups; (in groups of) threes and fives — literal

Yojijukugo
きゃく三々 さんさん五々 ごご到着 とうちゃくした。
kyakuwa sansangogo tōchaku shita.
Guests arrived by twos and threes.
Other forms: