Definition: The phrase "siphon off" means to draw or take away something, usually in a way that is not very noticeable or is done secretly. It's like using a tube (called a siphon) to move liquid from one place to another, but in a figurative sense, it often refers to taking away money, resources, or other things.
The phrase primarily refers to the act of taking away resources, but it can also apply to the transfer of ideas or influences in some contexts.
While "siphon off" is a specific phrase, it is related to the idiom "to take something for oneself" which covers a similar idea of taking resources for personal use.
"Siphon off" is a useful phrase to describe the act of secretly or subtly taking something away, especially in contexts involving money or resources.