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1. Literally, to move up into view above the surface of something. Otters often bob up in this part of the harbor, so it's a great place to take photographs.
2. To appear, arise, or come into being quickly and/or unexpectedly. We thought the meeting was over until several questions bobbed up from the back row. The city is deceptively small, and acquaintances often bob up at the most unexpected places.
Appear suddenly or unexpectedly. For example, I didn't know anyone in the group until Harry bobbed up. This term uses the verb bob in the sense of "to bounce," a usage dating from Chaucer's day. [Late 1800s]
To come to the surface quickly, especially after being underneath for a short time: I didn't think anyone else was swimming in the pond, but then someone's head bobbed up right in front of me.