I have a question about the usage of the phrase "keep any shape" here:
Liquids, says Bauman, do not keep any shape for long and are constantly prone to alteration.
I looked up a dictionary, but did not find the phrase "keep any shape" or "keep shape". I then tried finding a sense of the verb "keep" that would fit this usage, but found none.
Could this usage of "keep" be scientific lingo?