This is the 3445th most frequent Arabic word.
مد
"مد" (mad) means "extension," "stretching," or "prolongation."
Here 'مد' indicates 'increase' or 'spread' in a figurative sense, relating to growth.
يُلاحظ مد في الدعم الشعبي للحملة.
An increase in popular support for the campaign is noted.
Here 'مد' is used to mean 'extended' as in reaching out physically.
مد الرجل يده لمساعدة الطفل.
The man extended his hand to help the child.
In this case, 'مد' refers to the phenomenon of 'high tide' where water advances.