Therefore We covered up their (sense of) hearing (causing them, to go

﴿فَضَرَبۡنَا عَلَىٰٓ ءَاذَانِهِمۡ فِي ٱلۡكَهۡفِ سِنِينَ عَدَدٗا ﴾
[الكَهف: 11]

Therefore We covered up their (sense of) hearing (causing them, to go in deep sleep) in the Cave for a number of years

﴿فضربنا على آذانهم في الكهف سنين عددا﴾ [الكَهف: 11]

Al Bilal Muhammad Et Al
Then We drew a veil over their ears for a number of years while in the cave

Ali Bakhtiari Nejad
And We sealed their ears (and made them sleep) in the cave for a number of years

Ali Quli Qarai
So We put them to sleep in the Cave for several years

Ali Unal
Then We drew a veil over their ears (causing them to go into a deep sleep) in the cave for a number of years

Hamid S Aziz
And We struck their ears (with deafness) in the cave for a number of years

John Medows Rodwell
Then struck we upon their ears with deafness in the cave for many a year

Literal
So We stamped/resided/palpitated (refer to in dictionary) on their ears in the cave numerous years

Mir Anees Original
So We prevented them from hearing (and kept them sleeping) in the cave, for a number of years

Mir Aneesuddin
So We prevented them from hearing (and kept them sleeping) in the cave, for a number of years