disallow

UK: /ˌdɪsəˈlaʊ/ US: /ˌdɪsəˈlaʊ/ ,(dis′ə lou′)

WordReference Random House Learner's Dictionary of American English © 2025

dis•al•low /ˌdɪsəˈlaʊ/   v. [~ + object]

1. to reject;
   refuse to allow or accept;
   refuse to admit the validity of:
   The judge disallowed our claim.

WordReference Random House Unabridged Dictionary of American English © 2025

dis•al•low  (dis′ə lou′), v.t. 

1. to refuse to allow;
   reject;
   veto:
   to disallow a claim for compensation.
2. to refuse to admit the truth or validity of:
   to disallow the veracity of a report.

• Old French desallouer. See dis-¹, allow
• Middle English 1350–1400

dis′al•low′a•ble, adj. 
dis′al•low′a•ble•ness, n. 
dis′al•low′ance, n. 

Collins Concise English Dictionary © HarperCollins Publishers::

disallow / ˌdɪsəˈlaʊ/ verb (transitive)

1. to reject as untrue or invalid
2. to cancel

ˌdisalˈlowable adjective

ˌdisalˈlowance noun