静坐

to sit quietly / to meditate / to stage a sit-in

still / calm / quiet / not moving

to sit / to take a seat / to take (a bus, airplane etc) / to bear fruit / variant of 座[zuo4]

sit-in strike

akathisia (condition of restlessness, a side-effect of neuroleptic antipsychotic drug) / unable to sit still / hyperactivity / restlessness

sit-in protest

to sit still and do nothing / to sit tight

sit-in protest demonstration