Definition of lower verb from the Oxford Advanced American Dictionary

 

lower2

 verb
(also lour)verb
NAmE//ˈlaʊər//
 
[intransitive](literary)Verb Forms present simple I / you / we / they lower
 
he / she / it lowers
 
past simple lowered
 
-ing form lowering
 
 
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(of the sky or clouds) to be dark and threatening Huge clouds lowered over the bay. see also lower1
See the Oxford Advanced Learner's Dictionary entry: lower