A cramp is a muscle that will not let go. In dreams it is read as tension held too long, or effort pushed past the point where the body or the mind can stay loose.
Where in your waking life have you met something like this lately?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.