WordNet sense 1 (Israeli statesman (born in Russia) who (as prime minister of Israel) negotiated a peace treaty with Anwar Sadat (then the president of Egypt) (1913-1992)):

Menachem Begin

WordNet sense 2 (have a beginning characterized in some specified way):

start

WordNet sense 3 (set in motion, cause to start):

commence, lead off

WordNet sense 4 (take the first step or steps in carrying out an action):

get, set about, get down, set out, start out