to grasp (often fig.) / to control / to seize (initiative, opportunity, destiny) / to master / to know well / to understand sth well and know how to use it / fluency
掌
=
尚
+
手
:
Inside the anglepod (ang3), James II of England (zh) and the Buddhist monk (尚) play catch using two baseball gloves (手) and a horseshoe (掌).
握
=
屋
+
扌
:
Willy Walrus's (w) garden shack (屋) was just about to fall into the well in the observatory's bathroom (o4), but Willy was able to grasp (握) it at the last moment with a toy claw (屋).