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tap out たたく、打つ、たたき出す、

tap out an SOS SOS を打つ
tap out the figure on a calculator 電卓で数字を打ち出す

Starting Saturday, many cell phone users may find their beloved handsets even more indispensable. In addition to tapping out messages to their friends and surfing the Net, people will be able to see digital broadcasts of their favorite TV shows wherever they go, on their mobiles.