"In" is an English equivalent of the French word "en."
Specifically, the French word is a preposition. It includes among its meanings "in, into, to." The pronunciation is "aw."
in
en francais (in french): imbécile in english : idiot
To describe your state or situation. For e.g I am on vacation would be 'Je suis en vacances' ou en conges (where the e is accented)
"un arc-en-ciel" - pl. "des arcs-en-ciels"
en voiture means 'in (the) car' in French.
"fabriqué" made in England = "fabriqué en Angleterre"
Comment dit-on en français? in French is "How does one say in French?" in English.
Un film en anglais in French means "a film in English" in English.
En garde in French means "on (your) guard (because I am about to attack, in fencing)" in English.
En ré mineur in French means "in D minor" in English.
Travaillez en paires in French means "Work in pairs!" in English.
"On guard!" in English is en garde! in French.