Tenir isn't a word. However, the verb "tener" means to have.
Yo tengo - I have
Tu tienes - you have
El/Ella tiene - he/she has
Nosotros tenemos - we have
Vosotros tenéis - you(plural) have
Ellos/ellas tienen - they have
trop difficile à tenir is tranlslated 'too difficult to hold'. "tenir" may also be understood as in 'tenir une promesse', to stand true to a promise or commitment.
Tenir is a verb, not a noun in the French language. It means "to hold" or "to keep."
Tenir in French is "to take hold" in English.
tenir
"To hold," the infinitive verb, can be translated as "tenir".
Tenir
The cast of Tenir les murs - 2011 includes: Reda Kateb
to hold
Il tenir.
to stand = être debouttall = grandstanding tall: approx. "se tenir droit debout, se tenir tout debout"
tenant , se tenir
se tenir debout