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

ally

verb
 
/əˈlaɪ/,
 
/ˈælaɪ/
 
/əˈlaɪ/,
 
/ˈælaɪ/
[transitive, intransitive]
Verb Forms
present simple I / you / we / they ally
 
/əˈlaɪ/,
 
/ˈælaɪ/
 
/əˈlaɪ/,
 
/ˈælaɪ/
he / she / it allies
 
/əˈlaɪz/,
 
/ˈælaɪz/
 
/əˈlaɪz/,
 
/ˈælaɪz/
past simple allied
 
/əˈlaɪd/,
 
/ˈælaɪd/
 
/əˈlaɪd/,
 
/ˈælaɪd/
past participle allied
 
/əˈlaɪd/,
 
/ˈælaɪd/
 
/əˈlaɪd/,
 
/ˈælaɪd/
-ing form allying
 
/əˈlaɪɪŋ/,
 
/ˈælaɪɪŋ/
 
/əˈlaɪɪŋ/,
 
/ˈælaɪɪŋ/
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  1. ally (yourself) with somebody/something to give your support to another group or country
    • The prince allied himself with the Scots.
    Topics Discussion and agreementc2
    Word OriginMiddle English (as a verb): from Old French alier, from Latin alligare ‘bind together’, from ad- ‘to’ + ligare ‘to bind’; the noun is partly via Old French alie ‘allied’. Compare with alloy.
See ally in the Oxford Advanced American DictionarySee ally in the Oxford Learner's Dictionary of Academic English

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