straitjacket

Concise Oxford English Dictionary © 2008 Oxford University Press:
straitjacket /ˈstreɪtʤakɪt/ (also straightjacket)

▶noun

• 1 a strong garment with long sleeves which can be tied together to confine the arms of a violent prisoner or mental patient.

• 2 a severe restriction.

▶verb (straitjackets, straitjacketing, straitjacketed) restrain with or as if with a straitjacket.