I’m sorry, this seat is reserved.
It’s a popular restaurant, and you’ll have to reserve well in advance.
I reserved a room at the Lamb Hotel.
You can reserve the tickets. (Preliminary English Test; B1; Farsi)
This space is reserved for ambulances only.
These seats are reserved for the elderly and the disabled.
He reserved the right to veto any future plans.
You can also use streets reserved for walker[s]. (First Certificate in English; B2; French)
emergency cash reserves
I have a reserve of canned food in case of emergency.
The dependence on oil is a menace because oil reserves will disappear and because at this time we have no other invention to replace it. (Certificate of Proficiency in English; C2; French)
She keeps a little money in reserve.
It would be an idea to have some activity in reserve if you have to cancel something, such as the boat trip on the Thames. (Certificate in Advanced English; C1; Swedish)