ping (one)
To send one a message, typically to ask them a question or to get their attention. Let me ping Martin and figure out what time he's coming to the party. Sorry, I didn't that you'd pinged me on Skype until a few hours later.
ping-pong diplomacy
A term applied to the start of improved relations between the US and the People's Republic of China in the early 1970s, so named because of the US Table Tennis team's acceptance of an invitation to visit China. (Relations between the US and China had been strained since Communist leader Mao Zedong's rise to power in 1949.) Silly though it may sound now, ping-pong diplomacy really had a big role in precipitating President Nixon's landmark visit to China in 1972.
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