stricten

From strict +‎ -en.

stricten (third-person singular simple present strictens, present participle strictening, simple past and past participle strictened)

1. (transitive, intransitive, rare) To make or become strict; tighten
   • 1967, Economic Statistics, volume 10, numbers 3-12:

     The Bank of Japan strictened, since August, its guidance on the fund position of city banks; it raised, as from September, the official interest rate by #0.001 (per 100 yen per diem); and it also enforced a measure for restricting the increased loans to be extended by urban banks.

   • 2013, Issues in Global Environment—Pollution and Waste Management:

     According to the news editors, the research concluded: “Overall, the study indicates that paraffinic HVO fuels are suitable for emission reduction with valve and injection timing adjustment and thus provide possibilities for engine manufacturers to meet the strictening emission."

   • 2013, A. Fog, Cultural Selection:

     He has no other option than to find some laws that can be strictened, well knowing that it is wrong to make hasty legislation in a highly emotional climate.

• centrist, citterns