内職 ないしょく
naishoku

Noun
Suru Verb

1. side job (outside of one's main employment); side gig; side hustle

Intransitive
Noun
Suru Verb

2. homeworking; simple job carried out at home; home industry

Intransitive
Noun
Suru Verb

3. (secretly) working on something unrelated to the class (or conference, etc.) one is attending

Intransitive
Colloquial