expression, godan verb (-ku)
be arrested; be put in bonds
Literary or formal expression for being arrested or bound, often used in historical or dramatic contexts. The verb つく here is an old usage meaning 'to be bound' or 'to be tied'.
犯人はついに縛についた。
The criminal was finally arrested.
彼は縛につく覚悟を決めた。
He prepared himself to be put in bonds.