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

Trim level options are limited to adding surround-view cameras and a head-up display, along with Volvo’s infamous integrated child booster seats. —New Atlas, 31 July 2025

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

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