a river to be in flood

(river) be in flood

light gains make heavy purse, drop by drop fills the tub, i.e. greatness is nothing but many small littles

each knows the intricacies of his own trade, every profession even a mean job like horse-keeping too requires hard work to excel in it

tributary

say much in little, put something in a nutshell

bottom of river, depth of river

there is a satire on Muslims that occasions of Eid, Bakra id and Shab-Barat call the prostitutes and they mourn in Muharram

take advantage of an open opportunity

perform an impossible task

from the river