Taijiquan and other CMA lacks an anatomical base of reference when referring to such concepts but generically speaking Sun style taijiquan has the term open/close taijiquan based on an objective vista of open and closing hands with posture(s) but within open/close exists stick/compression (within push)/adhere/push/grab/trap!/based on degree of open/close of specific posture.
Sun style aka Kai/He taijiquan in some circles
open (Kai Shou) 开手
close (He Shou) 合手
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