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1 N‑COUNT [usu n N ] A booster is something that increases a positive or desirable quality. □  It was amazing what a morale booster her visits proved. □  Praise is a great confidence booster.

2 N‑COUNT A booster is an extra engine in a machine such as a space rocket, which provides an extra amount of power at certain times. □  Ground controllers will then fire the booster, sending the satellite into its proper orbit.

3 N‑COUNT A booster is a small injection of a drug that you have some time after a larger injection, in order to make sure that the first injection will remain effective.

4 N‑COUNT [N n] A booster is someone who supports a sports team, organization, person, or place very enthusiastically. [AM ] □  A former associate of Mr. Pierce's was among the project's boosters.

boo st|er seat (booster seats ) also booster cushion N‑COUNT A booster seat or a booster cushion is a special seat which allows a small child to sit in a higher position, for example at a table or in a car.

boot ◆◇◇ /buː t/ (boots , booting , booted )

1 N‑COUNT Boots are shoes that cover your whole foot and the lower part of your leg. □  He sat in a kitchen chair, reached down and pulled off his boots. □  He was wearing riding pants, high boots, and spurs.

2 → see also wellington

3 N‑COUNT Boots are strong, heavy shoes which cover your ankle and which have thick soles. You wear them to protect your feet, for example when you are walking or taking part in sport. □  The soldiers' boots resounded in the street.

4 VERB If you boot something such as a ball, you kick it hard. [INFORMAL ] □ [V n adv/prep] He booted the ball 40 yards back up field.

5 N‑COUNT The boot of a car is a covered space at the back or front, in which you carry things such as luggage and shopping. [BRIT ] □  He opened the boot to put my bags in. in AM, use trunk

6 PHRASE If you get the boot or are given the boot , you are told that you are not wanted any more, either in your job or by someone you are having a relationship with. [INFORMAL ] □  She was a disruptive influence, and after a year or two she got the boot.

7 PHRASE If someone puts the boot in , they attack another person by saying something cruel, often when the person is already feeling weak or upset. [BRIT , INFORMAL ]

8 PHRASE You can say to boot to emphasize that you have added something else to something or to a list of things that you have just said. [FORMAL , EMPHASIS ] □  He is making money and receiving free advertising to boot!

▸  boot out PHRASAL VERB If someone boots you out of a job, organization, or place, you are forced to leave it. [INFORMAL ] □ [V P n] Schools are booting out record numbers of unruly pupils. [Also V n P ]

▸  boot up PHRASAL VERB When you boot up a computer, you make it ready to use by putting in the instructions which it needs in order to start working. [COMPUTING ] □ [V P + from/with ] I can boot up from the CD. □ [V n P ] Go over to your PC and boot it up.

boo t camp (boot camps )

1 N‑VAR In the United States, a boot camp is a camp where people who have just joined the army, navy, or marines are trained. [AM ]

2 N‑VAR A boot camp is a set of intensive exercises done on a regular basis and designed to improve strength and fitness. [AM ]

bootee /buː tiː / (bootees or booties )

1 N‑COUNT [usu pl] Bootees are short woollen socks that babies wear instead of shoes.

2 N‑COUNT Bootees are short boots which come to just above the ankle. They are worn especially by women and girls.

booth /buː ð/ (booths )

1 N‑COUNT [usu n N ] A booth is a small area separated from a larger public area by screens or thin walls where, for example, people can make a phone call or vote in private. □  I called her from a public phone booth near the entrance to the bar. □  In Darlington, queues formed at some polling booths.