My father used to refer to people who played really well as playing like "gangbusters eating rice krispies." Perhaps that might have influenced three of the most important words that I use in lessons with students (both violin and recorder students) and in my own lessons with myself (in other words, when I am practicing).
Stop refers to a momentary stopping of the bow, which I find useful when thinking about plopping and popping: making sure all the necessary fingers are in place before the bow sounds the next pitch.
Plop refers to what the fingers do. In order to have a Milstein-like left hand, I try to always plop as many fingers down as possible. "Drop" might work for some people, but plop gives me a far more secure feeling. You can "drop" something by accident, but you "plop" on purpose, and you usually do it with a great sense of security.
Pop is what the fingers do when they release notes. When I have three fingers of the left hand down, and I pick up only the third finger, that lifted finger "releases" the note that the second finger is going to play. When I do this action with a feeling of "pop," there is a clarity to the released note. The word "lift" implies work. The word "pop" implies play.
The way it works on the recorder involves a momentary stop of the tongue before the fingers plop or pop.