you squeeze; you tighten
Tu es très concis et tu serres bien le sujet.
You are very concise and you cover the subject well.
Si tu serres pas, ça va fuir.
If you don't tighten it, it will leak.
— Demain tout commence (2016)
Tu serres tes assiettes.
You put your plates away.
— Laurence Anyways (2012)
Pourquoi tu serres cette pierre ?
Why are you holding that stone?
— Parasite (2019)