also iron-clad
If you describe a guarantee or plan as ~, you are emphasizing that it has been carefully put together, and that you think it is absolutely certain to work or be successful.
...~ guarantees of safe passage...
ADJ emphasis
also iron-clad
If you describe a guarantee or plan as ~, you are emphasizing that it has been carefully put together, and that you think it is absolutely certain to work or be successful.
...~ guarantees of safe passage...
ADJ emphasis
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012