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

 

unblock

 verb
verb
BrE BrE//ˌʌnˈblɒk//
 
; NAmE NAmE//ˌʌnˈblɑːk//
 
Verb Forms present simple I / you / we / they unblock
BrE BrE//ˌʌnˈblɒk//
 
; NAmE NAmE//ˌʌnˈblɑːk//
 
he / she / it unblocks
BrE BrE//ˌʌnˈblɒks//
 
; NAmE NAmE//ˌʌnˈblɑːks//
 
past simple unblocked
BrE BrE//ˌʌnˈblɒkt//
 
; NAmE NAmE//ˌʌnˈblɑːkt//
 
past participle unblocked
BrE BrE//ˌʌnˈblɒkt//
 
; NAmE NAmE//ˌʌnˈblɑːkt//
 
-ing form unblocking
BrE BrE//ˌʌnˈblɒkɪŋ//
 
; NAmE NAmE//ˌʌnˈblɑːkɪŋ//
 
 
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unblock something to clean something, for example a pipe, by removing something that is blocking it
See the Oxford Advanced American Dictionary entry: unblock