"The Day they are pushed" - meaning: they are driven "into the fire of Hell with a forceful pushing" - meaning: a forceful driving.
﴿يَوْم يدعونَ﴾ يُدْفَعُون ﴿إِلَى نَارِ جَهَنَّمَ دَعًّا﴾ دفعا