乗ず: archaic for 乗じる: (mathematics) to multiply; to take an opportunity, to seize an advantage / 成ず: (archaic) to become, to become complete; to accomplish or fulfill something

上手: (rare) skill, dexterity; flattery (from being told how skillful one is, even if one isn't); a person with the seventh dan in the games of shogi or go

(slang) pistol; gun / tiddlywinks

to flick and make something spring/jump / (of materials) to reject; to repel (some external substance) / (from the metaphor of beating beads of an abacus) to calculate

play (a stringed or keyboard musical instrument)

the diagram above; the top illustration

skillful, dexterous

(rare) skill, dexterity / flattery (from being told how skillful one is, even if one isn't) / a person with the seventh dan in the games of shogi or go

(music) a piano

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend