Etymology
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boost (v.)

"to lift or raise by pushing from behind," 1815, literal and figurative, American English, of unknown origin. Related: Boosted; boosting. As a noun, "a lift, a shove up, an upward push," by 1825.

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Definitions of boost
1
boost (v.)
increase;
Synonyms: hike / hike up
boost (v.)
give a boost to; be beneficial to;
The tax cut will boost the economy
boost (v.)
contribute to the progress or growth of;
Synonyms: promote / advance / further / encourage
boost (v.)
increase or raise;
boost the voltage in an electrical circuit
Synonyms: advance / supercharge
boost (v.)
push or shove upward, as if from below or behind;
The singer had to be boosted onto the stage by a special contraption
2
boost (n.)
the act of giving hope or support to someone;
Synonyms: encouragement
boost (n.)
an increase in cost;
Synonyms: rise / hike / cost increase
boost (n.)
the act of giving a push;
he gave her a boost over the fence
From wordnet.princeton.edu