1.
If you ~ something that you do not want such as an illness or a bad habit, you manage to recover from it or get rid of it.
Businessmen are trying to ~ habits learned under six decades of a protected economy...
He was generally feeling bad. He just couldn’t shake it off.
PHRASAL VERB: V P n (not pron), V n P
2.
If you ~ someone who is following you, you manage to get away from them, for example by running faster than them.
I caught him a lap later, and although I could pass him I could not shake him off...
He was unaware that they had shaken off their pursuers.
PHRASAL VERB: V n P, V P n (not pron)
3.
If you ~ someone who is touching you, you move your arm or body sharply so that they are no longer touching you.
He grabbed my arm. I shook him off...
She shook off his restraining hand.
PHRASAL VERB: V n P, V P n (not pron)