- 1siphon something (+ adv./prep.) to move a liquid from one container to another, using a siphon I siphoned the gasoline out of the car into a can. The waste liquid needs to be siphoned off.
- 2 siphon something (+ adv./prep.) (informal) to remove money from one place and move it to another, especially dishonestly or illegally synonym divert She has been accused of siphoning off thousands of dollars from the company into her own bank account.
NAmE//ˈsaɪfn//Verb Forms present simple I / you / we / they siphon
he / she / it siphons
past simple siphoned
-ing form siphoning