crimp (v.)

 late 14c., "cause to contract or be wrinkled or wavy." Old English had gecrympan "to crimp, curl," but the modern word probably is from Middle Dutch or Low German crimpen/krimpen "to shrink, crimp." Sense of "bend back or inward, draw together" is from 1712. Related: Crimped; crimping.

"that which has been crimped or curled," 1863, "natural curl in wool fiber," from crimp (v.). In reference to crimped hair by 1867. To put a crimp in or on (something) is by 1896, U.S. slang.