From Hull AWE
You were looking for 'do'. AWE has pages on:
- The abbreviation do, or do, at Do (abbreviation);
- The forms of the irregular verb 'to do' at do (irregular verb);
- A peculiarity of the pronunciation of these at Do - does - doesn't - don't (phonetic).
- There are also various informal nouns of this appearance. 'A do' may be:
- 'a social gathering', 'a party', or some kind of pre-arranged event, like an entertainment or a military engagement. Its plural is properly 'dos', but both singular and plural should be avoided in academic writing;
- 'a cheat', 'a deception' - also to be avoided in academic writing;
- (usually plural) in such phrases as 'fair dos' (sometimes 'fair doos', 'fair do's' or 'fair does') it means 'dealing', 'treatment' - also to be avoided in academic writing;
- in the singular, a fair do may mean 'a success', especially in Australian English
- in the plural phrase dos and don'ts, 'dos' means 'the things that one is supposed to do', as opposed to the things which one is supposed not to do.