As Audi said, you may find some useful information in the prior threads about form names.
Here’s a bit more on “zhou di kan chui.” Xu Yusheng, in his 1921 book, _Taijiquan shi tujie_, gives some interesting commentary on many of the form names. For "zhou di kan chui," he wrote that the verb "kan" here has the meaning, "kan4 shou3," a compound that means, "to stand guard," or "to watch over." This opens up several possible meanings for the form name, such as "guarding fist under elbow," "guarded fist under elbow," and the like. I've also read commentary that suggests that the fist under elbow is a "hidden fist," that can be suddenly revealed. The notion of standing guard or being watchful suggests a reserving or storing up of power, only to be issued when the situation calls for it and the opportunity is right.
Xu Yusheng's book also used a different character for "chui" than the one commonly seen in the taiji form name, this one with the metal classifier rather than the hand classifier, and with the nominal meaning “a hammer,” or the verbal, “to hammer.” There are in fact several “chui” character variants with related meanings of “to pound” or the like, but I think these are used ideomatically in martial arts for fist, or the action of a fist.