To strike the flag

to haul it down, in token of respect, submission, or, in an engagement, of surrender.

See also: Flag

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From Sana'a, Pushkar plans to travel on to explore the rest of the Arabian Peninsula while the weather is still cool, before slowly making his way back to Nepal where, in 2010, he plans to climb Mount Everest to strike the flags of all the countries he has visited on its summit.