stairs, steps
These stairs are deadly.
— L'Histoire personnelle de David Copperfield (2019)
Combien de marches a cet escalier ?
How many steps does this staircase have?
Tom et Marie étaient assis sur les marches du bâtiment et parlaient.
Tom and Marie were sitting on the steps of the building and talking.
J'ai trébuché sur les marches.
I tripped on the steps.