■ noun
1》 ( ~s ) a pair of fetters connected by a chain, used to fasten a prisoner's wrists or ankles together.
↘restraints or impediments.
2》 a metal link, typically U-shaped, closed by a bolt and used to secure a chain or rope to something.
■ verb
1》 chain with ~s.
2》 restrain; limit.
Origin
OE sc(e)acul 'fetter', of Gmc origin.