(education) Grades or marks that are consistently A's.

(idiomatic) A face that is expressionless, especially not laughing.

(idiomatic, transitive) Synonym of clarify: to make clear, to reach an understanding.

A jacket-like garment with very long sleeves which can be secured in place, thus preventing the wearer from moving his or her arms. Often used in psychiatric hospitals to prevent patients from injuring themselves or others.

(literally) To put someone into a straitjacket. / (by extension) To restrict the freedom of, either physically or psychologically.

(athletics) The straight part of a running track (or similar) leading to the finishing line.

(athletics, horse racing) The straight part of a racetrack, running track, etc., opposite the finishing line; the backstretch.

A path of honesty; procedure according to rules and plans.

A layer of silicon atoms deposited onto a substrate of silicon germanium constrained to be wider apart than normal; this decreases resistance and increases performance when made into a chip.

(transitive, idiomatic) To correct; to make right or true.