booster ( boosters plural )
1 n-count A booster is something that increases a positive or desirable quality.
usu n N
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 A booster is someone who supports a sports team, organization, person, or place very enthusiastically. (AM) oft supp N, N n
(=supporter) A former associate of Mr. Pierce's was among the project's boosters.
booster seat ( booster seats plural ) , booster cushion 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. n-count
morale booster ( morale boosters plural ) You can refer to something that makes people feel more confident and cheerful as a morale booster. n-count usu sing
This win has been a great morale booster.
Traducción diccionario Collins Inglés Cobuild
morale boost, morale booster
something that improves morale
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"