This is the 5717th most frequent German word.
boostern
"Boostern" means to receive a booster vaccination.
In this sentence, 'boostern' refers to receiving a booster dose of a vaccine for further immunity.
Ich habe mich gestern gegen Grippe aufgeboostert.
I boosted myself against the flu yesterday.
Here, 'boostern' means enhancing or strengthening the performance, in this context, the immune system.
Das neue Medikament boostert das Immunsystem effektiv.
The new medication effectively boosts the immune system.
In this example, 'boostern' is used figuratively to mean improving or enhancing capabilities or performance.