say when(redirected from say when!)
Tell me when to stop. Typically said when one is filling a container with something. I'll pour the cereal, you say when, OK?
Inf. Tell me when I have given you enough of something, usually a liquid. (Sometimes answered simply with When.) Tom (pouring milk into Fred's glass): Say when, Fred. Fred: When. John: Do you want some more juice? Mary: Yes. John: Okay. Say when.