double
The French word for 'double' is also 'double'. It is used in the same way as in English, to describe something that is twice the size, amount, or degree. For example, 'un double espresso' is an espresso with twice the amount of coffee.
He ordered a double serving.
This phrase is used in the context of ordering food. A 'double portion' means twice the usual amount of a particular dish.
She has a double identity.
This is a phrase used in mystery or crime contexts. 'Double identity' refers to a person who has two separate sets of identities which are used in different contexts.
This dessert has a double flavor.
This phrase is commonly used in culinary contexts. 'Double flavor' means that the dessert has two distinct tastes.