Dear Teachers,<br/><br/>1. - Can we at least open the window and get some ventilation here?<br/><br/> - Knock yourself out<br/><br/> - Thanks. I will.<br/><br/>- What does "knock yourself out" mean here?<br/><br/>2. - I've got to finish a report by ten, and then I'll have to attend a senior staff meeting. Then I'll have a meeting with my colleagues over lunch.<br/><br/>- Wow! That's cutting it close. <br/><br/>- What does "that's cutting it close" mean here?<br/><br/>Thanks a million to Teachers,<br/><br/> Stevenukd.