kho : [ind.] indeed; really; surely; (an enclictic particle of affirmative and emphasis).
 

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

Kho [before vowels often khv'; contr. of khalu=Sk. khalu] an enclitic particle of affirmation & emphasis: indeed, really, surely; in narration: then, now (cp. kira); in question: then, perhaps, really. Def. as adhikār' antara -- nidassan' atthe nipāto KhA 113; as avadhāraṇaŋ (affirmative particle) PvA 11, 18. -- A few of its uses are as foll.: abhabbo kho Vin i.17; pasādā kho D ii.155. After pron.: mayhaŋ kho J i.279; ete kho Vin i.10; idaŋ kho ibid.; so ca kho J i.51; yo kho M i.428; -- After a negation: na kho indeed not J ii.111; no ca khv' āssa A v.195; mā kho J i.253; -- Often combd with pana: na sakkhā kho pana "is it then not possible" J i.151; api ca kho pana J i.253; siyā kho pana D ii.154; -- Following other particles. esp. in aoristic narration: atha kho (extremely frequent); tatra kho; tâpi kho; api ca kho; evaŋ bhante ti kho; evaŋ byā kho Vin iv.134; Dh i.27, etc. -- In interr. sentences it often follows nu: kin nu kho J i.279; atthi nu kho J iii.52; kahan nu kho J i.255.

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

kho: adv. 確實

巴漢辭典 編者：(斗六) 廖文燦

he; she; it

Jeffrey Hopkins' Tibetan-Sanskrit-English Dictionary