Run down and Shoot down

Run down verb - To come upon after searching, study, or effort.

Shoot down and run down are semantically related In some cases you can use "Shoot down" instead a verb "Run down".

Shoot down verb - To make (someone or something) the object of unkind laughter.

Run down and shoot down are semantically related in shame topic. Sometimes you can use "Run down" instead a verb "Shoot down", if it concerns topics such as embarrass, detract.