0 something that improves or increases something: --
a confidence/morale booster
1 an engine on a spacecraft that gives extra power for the first part of a flight: --
a rocket booster
2 a small amount of a substance that is given to increase the effect of the same substance given some time before, to continue to protect a person from illness: --
a polio booster
3 an action or thing that improves or increases something: --
4 the first stage of a rocket (= object sent into space) that pushes it off the ground --
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Можем да го завършим стъпка по стъпка, колкото и дълъг да е пътят и не може да бъде завършен, колкото и кратък да е пътят, ако дори не маркирате отпечатъка си.