To hit or knock against something with a jolt. I accidentally bumped into the table and spilled my drink.
To move someone or something to a different position, often in a queue or schedule. The flight was overbooked, so they bumped me to a later one.
To increase or raise something, such as a price or level. The company decided to bump the prices of their products due to increased demand.
To encounter someone unexpectedly. I bumped into an old friend at the grocery store yesterday.