manipulate
v.
1827, "to handle skillfully by hand," a back-formation from manipulation. Of mental influence, from 1864. Financial sense is from 1870. In mid-20c., it served as a euphemism for "masturbation." Related: Manipulated; manipulating.
〔李〕v.操作 [pulate=to fill] ←mani-[L] =hand手
〔李〕[man=hand手；-i-;pulate (=ply)=to fill装填→“to fill by hand手工装填”→] v. handle with skill熟练地操作