U

begun

verb

past participle of begin.

verb (used without object), be·gan, be·gun, be·gin·ning.

to proceed to perform the first or earliest part of some action; commence; start: The story begins with their marriage.
to come into existence; arise; originate: The custom began during the Civil War.

verb (used with object), be·gan, be·gun, be·gin·ning.

to proceed to perform the first or earliest part of (some action): Begin the job tomorrow.
to originate; be the originator of: civic leaders who began the reform movement.
to succeed to the slightest extent in (followed by an infinitive): The money won’t even begin to cover expenses.

verb

the past participle of begin

noun

Menachem (məˈnɑːkɪm). 1913–92, Israeli statesman, born in Poland. In Palestine after 1942, he became a leader of the militant Zionists; prime minister of Israel (1977–83); Nobel peace prize jointly with Sadat 1978. In 1979 he concluded the Camp David treaty with Anwar Sadat of Egypt

verb -gins, -ginning, -gan or -gun

to start or cause to start (something or to do something)
to bring or come into being for the first time; arise or originate
to start to say or speak
(used with a negative) to have the least capacity (to do something)he couldn’t begin to compete with her
to begin with in the first place

past participle of begin.

Old English beginnan “to begin, attempt, undertake,” a rare word beside the more usual form onginnan (class III strong verb; past tense ongann, past participle ongunnen); from bi- (see be-) + West Germanbic *ginnan, of obscure meaning and found only in compounds, perhaps “to open, open up” (cf. Old High German in-ginnan “to cut open, open up,” also “begin, undertake”), with sense evolution from “open” to “begin.” Cognates elsewhere in Germanic include Old Frisian biginna “to begin,” Middle Dutch beghinnen, Old High German beginnan, German beginnen, Old Frisian bijenna “to begin,” Gothic duginnan.

In addition to the idioms beginning with begin

beginning of the end, the
begin to see daylight
begin to see the light
begin with

also see:

charity begins at home
(begin to) see the light
to start (begin) with