Idiom of the day :- Top off / up

Usage, examples and definition of the Idiom :-

Bob and Tim are celebrating. With a bottle in one hand, Tim asks: ‘May I top your glass up!’. ‘Certainly, old pal, top it off,’ Bob said. Glug, glug, glug went the bottle as his glass was topped up, for this expression means to fill a partly full container – a glass, a tank, etc. – to the very top with liquid. ‘Thanks,’ Bob smiled. ‘My pleasure,’ Tim replied.