dat kan bruin niet trekken

Etymology
Literally, “[the] brown [horse] can't pull that”. From older, which referred to a donkey (or a grey horse according to some authors). Several authors include daar moet een bruin voor wezen “a brown [horse] has to be in front of that” behind the variant about the donkey; this clause is otherwise unattested but could explain the shift from grey to brown.

Proverb

 * 1) That is too expensive.