noun, feminine/pɛ̃s.mɔ̃.sɛ.ɲœʁ/plural: pinces-monseigneur
crowbar; bolt cutter
Synonyms: pied-de-biche, coupe-boulons
From pince (“pincer, pliers”) + monseigneur. The French Academy gives the following explanation to explain the term: because ironically it was said that all doors open in front of high-ranking people.