shrug

v. i. To raise or draw up the shoulders, as in expressing doubt, indifference, dislike, dread, or the like. [ 1913 Webster ]

They grin, they shrug.
They bow, they snarl, they snatch, they hug. Swift. [ 1913 Webster ]

n. A gesture consisting of drawing up the shoulders, -- a motion usually expressing doubt, indifference, or dislike; -- it is sometimes accompanied by a slight turning of the hands outward or upward. Such a gesture may be made, as in answering "who knows" to a question, suggesting utter ignorance of an answer and a disinclination to pursue the topic further. [ 1913 Webster +PJC ]

On Sept. 23, in a major speech in New York, the chairman of the Securities and Exchange Commision, Arthur Levitt asked the Big Board to spike the rule [ Rule 390 ] in the interest of free and unfettered markets. . . . Mr. Grasso responded with a shrug, saying that he had no plans to kill the rule. Gretchen Morgenson (N. Y. Times Nov. 28, 1999 sect. 3 p. 1. [ PJC ]

The Spaniards talk in dialogues
Of heads and shoulders, nods and shrugs. Hudibras. [ 1913 Webster ]