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 elimination of Nate means yet another one of my preseason picks to win the game have — like the lady sitting next to me at the Patti Smith book reading and concert last night who required a booster seat — come up short. —Dalton Ross, Entertainment Weekly, 6 Nov. 2025

Car Seats Car seats and booster seats have an expiration date after which they cannot be sold. —Brandee Gruener, Southern Living, 5 Nov. 2025

They can be used as rear-facing or front-facing while some can be used as booster seats. —Keenan Thompson, USA Today, 26 Oct. 2025

The bill also would have required all children younger than 10 to use booster seats and bar all those under 13 from sitting in the front seat. —Calmatters, Mercury News, 15 Oct. 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