kāi​xiǎo​chāi

be absent-minded

开小差 (開小差) kāi​xiǎo​chāi
be absent-minded expression
to be distracted or lose focus, especially during a meeting or class
desert abbreviation
to abscond from the army or be absent without leave (AWOL)

Frequency

Movie subtitles
0.600 per million appears in 0% of films
Written text
0.512 per million

Sources

Definitions
CC-CEDICT