ETYM as. twin, properly, a twisted or double thread; akin to Dutch twijn, Icel. twinni; from twi-. Related to Twice, Twin.
1. A strong thread composed of two or three smaller threads or strands twisted together, and used for various purposes, as for binding small parcels; SYN. string, cord, rope, lace.
2. A twist; a convolution.
To grow upward.