What is the meaning of Būt?

to be, to exist

to be, to be at, to be located (at)

to be at, to attend, to participate in

to possess; to have (all senses)

to have, in a part-whole relationship

to be, to happen, to take place

to be; used as a simple copula to link a subject to its predicate

to be, to have, must, should; used as an auxiliary verb to form compound verb tenses

Source: wiktionary.org