Spoken tone change to: bú dà. “bú dà” shows how the tone of “不” (normally fourth tone – bù) changes to a second tone (bú) when followed by a fourth-tone word like “大”.
(adv) not; no; won’t; not want to; cannot
(adv) used in a sentence to indicate that it is a question
(adj) big; large; great
(adj) eldest
(adj) age
(adj) For [dài] : same as 大(dà), used in 大夫(doctor, physician), 大王(king)
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