sit still
To remain motionless.
The dog wouldn't sit still while I gave him a bath.
VERBS
be, hold, keep, lie, sit, stand, stay
The dog finally lay still after running around the park all afternoon.
hold sb/sth, keep sb/sth
The nurse asked me to keep the patient still during the blood test.
ADV
very
absolutely, quite, stock-
The frightened rabbit remained absolutely still when it heard the dog barking outside.
VERBS
be, look, seem
become, go
The classroom became still when the teacher walked in with an announcement.
remain
ADV
very
completely
The lake water remained completely still after the rain stopped.
strangely
Even though it was noon, the classroom remained strangely still while everyone waited for the test results.