Definition of disallow verb from the Oxford Advanced American Dictionary

 

disallow

 verb
verb
NAmE//ˌdɪsəˈlaʊ//
 
disallow something[often passive]Verb Forms present simple I / you / we / they disallow
 
he / she / it disallows
 
past simple disallowed
 
-ing form disallowing
 
 
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to officially refuse to accept something because it is not valid to disallow a claim/an appeal The second goal was disallowed. compare allow
See the Oxford Advanced Learner's Dictionary entry: disallow