| boost | (noun) the act of giving hope or support to someone | Synonyms: encouragement |
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| (noun) the act of giving a push | - |
| (noun) an increase in cost | Synonyms: cost increase, hike, rise |
| booster | (noun) an additional dose that makes sure the first dose was effective | Synonyms: booster dose, booster shot, recall dose |
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| (noun) the first stage of a multistage rocket | Synonyms: booster rocket, booster unit, takeoff booster, takeoff rocket |
| (noun) an amplifier for restoring the strength of a transmitted signal | Synonyms: booster amplifier, booster station, relay link, relay station, relay transmitter |
| (noun) a thief who steals goods that are in a store | Synonyms: lifter, shoplifter |
| (noun) someone who is an active supporter and advocate | Synonyms: plugger, promoter |
| (noun) a person who backs a politician or a team etc. | Synonyms: admirer, champion, friend, protagonist, supporter |