عَلَى مَوْطِنٍ يَخْشَى الْفَتَى عِنْدَهُ الرَّدَى
مَتَى تَعْتَرِكْ فِيهِ الْفَرَائِصُ تَرْعَدِ
Meaning: I stood in a place where even a young man fears destruction: as danger presses in, the soft muscles near the shoulder and side begin to tremble.
Mawṭin is a place of encounter, radā death or ruin, and farāʾiṣ are the soft muscles around the upper side of the body whose trembling signifies fright. A bodily reaction becomes a tangible image of inward fear.