a seat that you put on a car seat, or on a chair at a table, so that a small child can sit higher
The small child required a booster seat so she could eat more comfortably at the table.

a door or similar space that you go through to leave a place
The airplane had six exits.

to be appropriate for something
It is hard to find the piece that fits correctly in this jigsaw puzzle.

not allowed
Students are forbidden to have their cell phones on while they are in class.

a moveable part of the car that usually covers the engine on a front-engine vehicle
My dad opened the hood of the car and took a look at the engine.

to pay careful attention to
Joe needs to keep track of the emails we've been getting.

any person walking on a sidewalk, across a street, or down a road
In America, most pedestrians have the right of way; this is not true in some other countries.

to defend someone or something from harm or danger
Wearing a helmet can protect your head.

a small pool of water or liquid on the ground
The pig rolled in the puddle of mud.

in the process of being completed
The skyscraper has been under construction for the past three years.