Chop

The use of the word ‘chop’ to mean ‘stamp’ is unique to this part of the world, so please be careful, business people in the West will be quite confused.

The word ‘chop’ was originally from the Malay word cap, which is from the Hindi word छाप ćhāp (stamp).

On a side note, the Singlish word ‘chope’ (Slang for reserving a seat) was derived from chop; to leave a mark.