[掌握, zhǎng wòㄓㄤˇ ㄨㄛˋ] to grasp (often fig.); to master; to know well; to understand sth well and know how to use it; fluency; to control; to seize (initiative, opportunity, destiny)#1674
[にぎる, nigiru] (v5r, vt) (1) to clasp; to grasp; to grip; to clutch; (2) to make (nigirizushi, rice ball, etc.); to form; to press into shape; to mold; to mould; (3) to seize (power, etc.); to take hold of; (P)#16270
[にぎりつぶす, nigiritsubusu] (v5s, vt) (1) to crush (with one's hands); (2) to kill a proposal; to shelve; to table (remove from consideration); to pigeonhole; to smother