ارتعد

He trembled, quivered, quaked, shivered, or became in a state of commotion, (S, A, L, Msb, K,) by reason of fear, (A, L,) or cold, (A,) &c.; (L;) as also رعد, aorist يرعد: (Msb: [written in my copy without any syll. signs; but it seems to be indicated that it is ↓ رَعَدَ aorist يَرْعُدُ: I believe, however, that ↓ رُعِدَ is also used in this sense, and in the sense here following:]) he was affected with a tremour, quivering, quaking, shivering, or commotion; (A, L;) as also ↓ أُرْعِدَ, (S, A, L, K,) and ↓ تَرَعْدَدَ, (L,) and ↓ ترعّد; (TA;) by fear, (A, L,) or cold, (A,) &c. (L.) You say, فَرَايءِصُهُ عِنْدَ ↓ أُرْعِدَتْ الفَزَعِ (tropical:) [His muscles called the فرايءصَ (plural of فَرِيصَةٌ q. v.) quivered on the occasion of fright]. (S, A, * L.) And الأَلْيَةُ ↓ تَرَعَّدَتِ, (K,) or, as in some of the Lexicons, ↓ تَرَعْدَدَت, (TA,) (tropical:) The الية [or buttock, or buttocks, &c.,] quivered, or moved to and fro: (K, TA:) and in like manner one says of anything subject to such motion; as [the kinds of food called] قَرِيس and فَالُوذ, and a hill or heap of sand, and the like. (TA.)