contraction
noun [ U ] uk/kənˈtræk.ʃən/ us/kənˈtræk.ʃən/
(REDUCTION)
收缩；缩小；缩短
the fact of something becoming smaller or shorter
Cold causes contraction of the metal. 金属遇冷收缩。
The contraction of this muscle raises the lower arm. 这块肌肉收缩使下臂抬起。
收缩，缩减
the fact of becoming less in amount or quantity
the contraction of economic output 经济产出的缩减
(MUSCLE)
[ C ]（妇女分娩时宫内肌肉的）收缩，痉挛;子宫收缩
one of the very strong and usually painful movements of the muscles in the womb that help to push the baby out of the mother's body during the process of birth
She was having regular strong contractions every four minutes. 她每4分钟有规律地强烈宫缩1次。
(WORD)
[ C ]（英语口语中的）缩略形式
a short form of a word or combination of words that is often used instead of the full form in spoken English
"Won't" is a contraction of "will not". won't 是 will not 的缩略形式。