crooked, bent
攣 centers on being physically twisted or pulled out of shape: crooked, bent, or contorted. The idea applies to limbs, objects, or anything drawn askew.
攣 combines 手 (hand) with 䜌, which likely contributes the sound and the idea of twisting or binding. The character suggests a hand pulling something into a crooked shape.
The top 䜌 looks like tangled threads (言 and 糸 elements), and the bottom 手 is a hand. Imagine a hand pulling tangled threads so tightly that everything becomes crooked and bent.
For レン, picture a hand bending a metal wrench until it's crooked: wrench -> レン, and the bent tool matches the kanji's meaning.
convulsion; cramp; spasm; tic; twitch; fit
arm disability; someone with disabled arms
scar
to cramp; to be cramped; to get a cramp (in)
to have a cramp
spasm
bronchospasm; bronchial spasm
to have convulsions
blepharospasm; spasmodic winking
gastrospasm; stomach spasm; stomach cramps
vaginismus; vaginal spasm
facial spasm; facial tic