وَعَكْسُهُ
And the reverse: naming a part by the name of the whole.
يَجْعَلُونَ أَصَابِعَهُمْ فِي آذَانِهِمْ
“They put their fingers into their ears.”
In Qurʾān 2:19, “fingers” literally names the complete digits. In the actual act of blocking the ears, it is the fingertips that enter. This is whole-for-part transfer.
The expression also vividly presents the act of blocking the ears, but the technical distinction is the relation between the named whole finger and the physically relevant tips.