乞讨 

Pinyin: qǐ tǎo 
Meaning：Mendicant; mendicancy; cadge
Sentence: 那个可怜的老人窝在角落已一整天了，向过路人乞讨着钱和食物。The poor old man has been humped over the corner for a whole day, begging money and food from passers-by.

More: 

乞： 

Pinyin: qǐ
Meaning: Beg 
Radical: 乙
Stokes: 3
Traditional: 乞
Common words/Phrase:
乞丐 [qǐ gài] 【beggar】
乞求 [qǐ qiú] 【beg】
乞食 [qǐ shí] 【food begging】
乞怜 [qǐ lián] 【beg for pity】

讨： 

Pinyin: tǎo
Meaning: Ask for; send punitive expedition; to demand
Radical: 讠
Stokes: 5
Traditional: 討
Common words/Phrase:
讨论 [tǎo lùn] 【to discuss】 
讨好 [tǎo hǎo] 【make up to】
讨厌 [tǎo yàn] 【nasty】
讨价还价 [tǎo jià huán jià] 【haggle over price】
商讨 [shāng tǎo] 【deliberate】