~ 1 [ dəʊ ]
(also do )
■ noun Music (in tonic sol-fa) the first and eighth note of a major scale.
↘the note C in the fixed-~ system.
Origin
C18: from Ital. do , an arbitrarily chosen syllable.
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~ 2 [ dəʊ ]
■ exclamation informal used to comment on a foolish action, especially one's own.