(idiomatic) In decline; going downhill; in trouble.

(idiomatic) To float an idea, (or otherwise do some action) to see what response or controversy (if any) it generates, usually as a preliminary step.

(idiomatic) Exactly what is necessary or useful in a given situation; something very beneficial or desirable.

Alternative form of what the doctor ordered

(idiomatic) Literally, exactly, following the rules as written.

drug on the market

Used other than figuratively or idiomatically: see in, groove.

(idiomatic) To understand the world in its previously unknown reality.

Happening hourly, but at 30 minutes past each hour; ie, 08:30, 09:30 etc. / Happening on the hour and at 30 minutes after the hour. / (soccer) At thirty minutes into a half.

(mathematics) Short for to the power of or to the ... (nth) power. / (slang) used in rap songs between the letters of a word being spelled