verb

reduce in extent or quantity; impose a restriction on.

civil liberties were further curtailed

reduce,cut,cut down,cut back,decrease,lessen,diminish,slim down,tighten up,retrench,pare down,trim,dock,lop,shrink,shorten,cut short,break off,truncate,restrict,put a restriction on,limit,put a limit on,curb,put the brakes on,rein in,rein back,chop