put at ease

put a blot on put a bold front on put a border on put a boycott on put a bridle on put a check on put a chill into sb put a crimp in put a crimp into put a curb on put a damp over put a damper on

principle of presumption of innoncence principle of program design principle of public administration principle of public opening principle of qualification principle of relativity principle of removal of constraint principle of retroactivity principle of rigidization principle of similitude