Definition of uncoil verb from the Oxford Advanced Learner's Dictionary

 

uncoil

 verb
verb
BrE BrE//ˌʌnˈkɔɪl//
 
; NAmE NAmE//ˌʌnˈkɔɪl//
 
[intransitive, transitive]Verb Forms present simple I / you / we / they uncoil
BrE BrE//ˌʌnˈkɔɪl//
 
; NAmE NAmE//ˌʌnˈkɔɪl//
 
he / she / it uncoils
BrE BrE//ˌʌnˈkɔɪlz//
 
; NAmE NAmE//ˌʌnˈkɔɪlz//
 
past simple uncoiled
BrE BrE//ˌʌnˈkɔɪld//
 
; NAmE NAmE//ˌʌnˈkɔɪld//
 
past participle uncoiled
BrE BrE//ˌʌnˈkɔɪld//
 
; NAmE NAmE//ˌʌnˈkɔɪld//
 
-ing form uncoiling
BrE BrE//ˌʌnˈkɔɪlɪŋ//
 
; NAmE NAmE//ˌʌnˈkɔɪlɪŋ//
 
 
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to become or make something straight after it has been wound or twisted round in a circle The snake slowly uncoiled. uncoil something/itself The huge snake uncoiled itself. to uncoil a rope
See the Oxford Advanced American Dictionary entry: uncoil