To press or squeeze out. [L. ex-premo, pp. -pressus, to press out]
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ex·press ik-'spres, ek- vt
1) to make known or exhibit by an expression
2 a) to force out by pressure <\express milk manually or by electric pump>
b) to subject to pressure so as to extract something <some pumps \express one breast at a time (Paula Lynn Parks)>
Medical dictionary. 2011.