Run down and Send up

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

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

Send up verb - To copy or exaggerate (someone or something) in order to make fun of.

Run down and send up are semantically related in ridicule topic. Sometimes you can use "Run down" instead a verb "Send up".