I don't think you've looked very hard. com/dictionary/liven < spiked the speech with humor> < spike the broth with peppers>5 : to drive (as a volleyball) sharply downward with a hard blow; also : to throw down sharply < spiked the ball in the end zone>6 : to undergo a sudden sharp increase in (temperature or fever) <the patient spiked a fever of 103°> intransitive verb : to increase sharply <battery sales spiked after the storm>
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