hard line
1. noun A strict and inflexible view of or position on something. I wouldn't come in late, if I were you—I hear the boss has a hard line on the attendance policy.
2. adjective Describing such a view or position. In this usage, the phrase can be hyphenated or written as one word. I wouldn't come in late, if I were you—I hear the boss has a hard-line attendance policy.
hard line
A firm, uncompromising policy or position. For example, The President was taking a hard line on the budget. [c. 1960]