booster

Everyday

1. A booster (booster seat) is a special raised seat that lifts a child up so the car's seat belt fits them safely. tree →
2. A booster (booster jab or shot) is an extra dose of a vaccine that keeps a person protected for longer. tree →
3. A booster is anything that increases or improves something («a confidence booster», «a rocket booster»). tree →

In the lessons

In road safety, children use booster seats until they are tall enough (around 135–150 cm, depending on the country) for the adult seat belt to fit across the shoulder and hips. In health lessons booster jabs keep vaccines working. In science, rocket boosters give extra push at launch. Phrases: «booster seat», «booster jab/shot», «mood booster», «rocket booster».

Examples

• My little sister still sits on a booster in the car. tree →
• You need a booster seat until you are tall enough for the seat belt. tree →
• I had a booster jab at the doctor's. tree →
• Winning the race was a real confidence booster. tree →
• The rocket's boosters fell away after launch. tree →
• A sunny day is a great mood booster. tree →
• The nurse said the booster would keep me protected. tree →
• Bring the booster seat when Grandma drives you. tree →

Note

Countable: «a booster». From «boost» (to push up or increase). Rules on booster seats differ by country; follow local law. The seat belt should go over the shoulder (not the neck) and low across the hips (not the tummy).