ציטירנדיקער פּירוש אויף יואל 2:9

like the roaring of the cisterns Like the sound of the roar of water gathering and falling into the cisterns in the river, so will those coming to plunder and pillage, roar. מַשַּׁק is an expression of roaring. Comp. (Prov. 28:15) “A roaring lion and a growling (שׁוֹקֵק) bear.” Also (Zeph. 2:9), “The noise (מִמְשַׁק) of the thorns.” When the wind blows on the thorns, and they knock against one another, they produce a sound. Comp. also, (Joel 2:9) “In the city they roar (יָשֹׁקּוּ).”

ויכס את עין כל הארץ ותחשך הארץ, “it covered the surface of the entire land and the land was darkened.” There was no area which remained free from locusts. The matter is comparable to Yoel 2,9: “they rush up the wall, they dash about in the city; they climb into the houses, they enter like thieves by way of the windows.” The word עין here is derived from גוון, i.e. all the normal colors on earth turned to look black.