If you wag your head, you move it from side to side, often because you are unhappy about a situation. He wags his head unhappily. = shake. A humorous or droll person; a wit
To move one way and the other with quick turns; to shake to and fro; to move vibratingly; to cause to vibrate, as a part of the body; as, to wag the head
{f} move from side to side or up and down; move the tongue rapidly (as in gossip or purposeless speech); shake, sway
If you wag your finger, you shake it repeatedly and quickly from side to side, usually because you are annoyed with someone. He wagged a disapproving finger