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

 

OK

 verb
(also okay)verb
BrE BrE//əʊˈkeɪ//
 
; NAmE NAmE//ˈkeɪ//
 
Verb Forms present simple I / you / we / they OK
BrE BrE//əʊˈkeɪ//
 
; NAmE NAmE//ˈkeɪ//
 
he / she / it OK's
BrE BrE//əʊˈkeɪz//
 
; NAmE NAmE//oʊˈkeɪz//
 
past simple OK'd
BrE BrE//əʊˈkeɪd//
 
; NAmE NAmE//oʊˈkeɪd//
 
past participle OK'd
BrE BrE//əʊˈkeɪd//
 
; NAmE NAmE//oʊˈkeɪd//
 
-ing form OK'ing
BrE BrE//əʊˈkeɪɪŋ//
 
; NAmE NAmE//oʊˈkeɪɪŋ//
 
 
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(OK’s, OK’ing, OK’d, OK’d) OK something (informal) to officially agree to something or allow it to happen She filled in an expenses claim and her manager OK'd it. synonym approve Word Origin mid 19th cent. (originally US): probably an abbreviation of orl korrect, humorous form of all correct, popularized as a slogan during President Van Buren's re-election campaign of 1840 in the US; his nickname Old Kinderhook (derived from his birthplace) provided the initials.Extra examples The President OK’d the execution of the man. The Senate Committee has OK’d the bill. The chairman OK’d the request. The property has to be valued before a mortgage loan is OK’d.
See the Oxford Advanced American Dictionary entry: OK