mark down

Short definition from Wiktionary

Verb

1. 1
   To reduce the price of.
2. 2
   To write a memorandum about.
3. 3
   To subtract marks or points from, for an error.
4. 4
   To write down.
5. 5
   To draw a conclusion about something; to consider something to be a certain way. (Typically used with as.)