booster seat

noun

: a portable seat that is placed on or attached to a chair or an automobile seat in order to raise a child to a higher position

… they should use a booster seat until they are 8 years old or at least 4 feet, 9 inches tall. Only after that can they ride in the front seat, and even then the back is always safer.

—Denise Milosevich

She's too big for a high chair, but needs to sit on her knees to keep her head fully above the dining room table. And she doesn't want a booster seat. She'll boost herself, thank you very much.

—Dave Manley

called also booster chair

Examples of booster seat in a Sentence

Recent Examples on the Web

The law also requires children between age 5 and 8 who are under four feet nine inches tall to use appropriate child restraint systems, such as booster seats. —Shelby Slade, AZCentral.com, 1 Aug. 2025

Kids 8 and under require a car seat or booster seat. —Nicholas Sullivan, Charlotte Observer, 18 July 2025

Here's how: My oldest son moved to the third row in his booster seat. —Melissa Willets, Parents, 3 Jan. 2025

When is your child legally allowed to move from a booster seat in the back to the front passenger seat? —Angela Rodriguez, Sacbee.com, 20 May 2025

Word History

First Known Use

1954, in the meaning defined above

Rhymes for booster seat

• bittersweet
• celestite
• incomplete
• indiscreet
• marguerite
• obsolete
• overeat
• overheat
• parakeet
• stillingfleet
• superheat
• amit