Write something up/Общая лексика bus.styl.

[ammeliette]

Please write something up on your letterhead and we will get back to you.

Не могу точно понять, это же просто "напишите что-нибудь на фирменном бланке...?", 

то есть имеется ввиду "write something upon...? или "write something up...?

Спасибо

[leka11]

нет, не "upon"http://www.multitran.com/m.exe?l1=1&l2=2&s=write up

[Amor 71]

Короче, "дайте информацию, как с вами связаться".

[johnstephenson]

'up' here is linked to 'to write' = 'to write (sth) up'. It's not linked to 'on' and isn't a mis-spelling of 'upon'.

'to write (sth) up' is just informal English for 'to write (sth)', where 'sth' = 'the relevant information/details'. Strangely, it means the same as 'to write (sth) down'. They both mean simply 'to write (sth)', so the 'up' can be ignored here.

'on your letterhead' isn't very good English; it should really be 'on letterheaded paper', ie 'on a sheet of paper with your organisation's letterhead on it'.

So the asker's understanding of the sense is correct.