The term 'make stricter' can be expressed in two different ways in a crossword puzzle: 'TIGHTEN' (7 letters) and 'tightenup' (9 letters). Both terms refer to the act of making something more strict or severe, usually by enforcing rules or regulations. This could involve increasing penalties for breaking laws, or making it harder to access certain services or resources. In either case, the goal is to make something more difficult or restrictive.