/ ˈreərɪŋ; NAmE ˈrer-/ adjective
raring to do sth ( informal ) very enthusiastic about starting to do sth :
The new recruits arrived early, all dressed up and raring to go (= to start) .
She is raring to get back to work after her operation.
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WORD ORIGIN
1920s: present participle of rare , dialect variant of roar or the verb rear .