1
general::
1. Fill a container, especially when it is almost full to begin with. For example, I don't need much gas; just top off the tank, please. [First half of 1900s] 2. Finish, especially in a spectacular way, as in They topped off their trip with a visit to the White House. [First half of 1800s]
American Heritage Idioms
2
general::
Phrase(s): top something off
to add to the difficulty of something. • Jane lost her job, and to top that off, she caught the flu. • I had a bad day, and to top it off, I have to go to a meeting tonight., Phrase(s): top something off (with something)
1. to end or terminate something with something; to put something on the top of something. • They topped the building off with a tall flagpole. • He topped off each piece of pie with a heap of whipped cream. 2. to celebrate an end to something with something. • They topped the evening off with a bottle of champagne. • They topped off the evening with a bottle of champagne.
McGrawhill's American Idioms And Phrasal Verbs