mid 18th century: from Italian do, an arbitrarily chosen syllable replacing ut, taken from a Latin hymn (see solmization)
An auxiliary verb. Like be and have, do can be used both as an auxiliary and as a main verb. It is a common and useful main verb in sentences such as:Overcoats will do more than keep you warm this winter. Citröen has done a lot of work in this area, starting back with the BX. Another assassin is waiting to do him in. As an auxiliary verb it is used: to make negative statements:Water lilies do not grow well if water is falling on to their leaves. to form questions:‘Do you understand me?’ he asked a second time. to form tag questions:Well, it doesn’t matter about anyone else, does it? They didn’t act like police, did they? for emphasis:And he does like to travel. to avoid repetition:I think you all know him better than I do.