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

When used correctly, car seats, booster seats, and seat belts protect young passengers. —Tanya Mohn, Forbes.com, 6 Sep. 2025

The seat can be placed on the ground or act as a booster seat on a chair, has a three-point harness and a removable, stashable tray that easily wipes clean. —Jenny Wiegand, Outside, 27 Aug. 2025

The law also requires children between age 5 and 8 who are under 4 feet 9 inches to use appropriate child restraint systems, such as booster seats. —Shelby Slade, AZCentral.com, 19 Aug. 2025

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

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