Definition of power-up in English:

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1 [mass noun] The action of switching on an electrical device, especially a computer: all files are loaded automatically on power-up
More example sentences
  • This self-calibration under power-up conditions keeps the performance optimised over the life of the sensor.
  • The controlled power up helps prevent supply glitches during power-up and also prevents excessive dissipation.
  • In the past, the operating system only had to search for the various devices connected to it on power-up, and once seen, the device would never go away.
2(In a computer game) a bonus which a player can collect and which gives their character an advantage such as more strength or firepower.
Example sentences
  • To this end, the game features special bonuses and power-ups for advanced players to explore.
  • To help keep these assaults from getting out of hand there are a couple of very handy dandy power-ups that players can collect in their travels through the levels.
  • There will be plenty of bonuses and power-ups to collect on the way.
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