2
general::
noun ADJ. great, important, powerful, strong | close Charles remained a close ally of the French king. | loyal, reliable, staunch, trusted | natural, useful, valuable | old, traditional Portugal is a traditional ally of England. | erstwhile, former | wartime | potential | European, NATO, Western, etc. | political VERB + ALLY have Jane felt that she had an ally. | find, gain, get | lose PREP. ~ against He now had an ally against his boss. PHRASES find/have an ally in sb She had found an ally in her old teacher. | a friend and ally a friend and ally of the president
Oxford Collocations Dictionary
4
general::
Phrase(s): ally (oneself) (with someone) (against someone or something)
to unite with someone in opposition to someone or something. • Sally allied herself with John against the committee. • We allied with the older ones against the younger ones. • They allied themselves against the attackers.
McGrawhill's American Idioms And Phrasal Verbs