She has a number of outfits which are worn for certain assignments or free times rather than her normal clothes.
Football has certain assignments and you can't really express yourself.
"Also, for certain assignments you boys probably make unbeatable agents," Rod said drily.
He frequently asked for Mom on certain assignments.
Each district name corresponded with a certain assignment of fire companies.
I have obligations that would make certain assignments impossible.
The letter added: "Some of these officers can no longer perform certain important assignments for which they were trained.
Touch assignments: Contestants are supposed to do a certain assignment without using their eyesight.
Those films had the trio trying to cooperate in performing a certain assignment given to them.
From time to time we have certain assignments that are - shall we say - very confidential.