bho : [ind.] (a familiar term of address), my dear; friend.

A.P. Buddhadatta Mahathera, Concise Pali-English and English-Pali Dictionary [available as digital version from Metta Net, Sri Lanka]

Bho (indecl.) [voc. of bhavant, cp. Sk. bhoḥ which is the shortened voc. bhagoḥ of Vedic bhagavant; cp. as to form P. āvuso>Sk. āyuṣmaḥ of āyuṣmant] a familiar term of address (in speaking to equals or inferiors): sir, friend, you, my dear; pl. sirs D i.88, 90, 93, 111; M i.484; Sn 427, 457, 487; with voc. of noun: bho purisa my dear man J i.423; bho brahmaṇā oh ye brahmans J ii.369. Double bho bho DhA iv.158.
   -- vādika=˚vādin Nd1 249. -- vādin a brahman, i. e. one who addresses others with the word "bho," implying some superiority of the speaker; name given to the brahman, as proud of his birth, in contrast to brāhmaṇa, the true brahman Sn 620; Dh 396; J vi.211, 214; DhA iv.158.

Pali-English Dictionary, TW Rhys Davids, William Stede,

bho(bhavant): indecl. 1.尊!(單數呼格) 2.尊們!(複數呼格)
 

巴漢辭典 編者：(斗六) 廖文燦