收缩 Traditional form: 收縮 Pinyin (reading): shōusuō Definitions: to pull back to shrink to contract (physiology) systole Characters: 收 - to collect, to gather, to harvest 缩 - to withdraw, to shrink, to pull back; abbreviation Traditional characters: 收 - to collect, to gather, to harvest 縮 - to withdraw, to shrink, to pull back; abbreviation