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sammeln sammeln 
1  vt to collect 
[Holz, Ähren, Fakten, Material, Erfahrungen auch] to gather 
[Blumen, Pilze etc] to pick, to gather 
[Truppen, Anhänger] to gather, to assemble 
neue Kräfte sammeln  to build up one's energy again 
seine Gedanken sammeln  to collect one's thoughts 
Punkte sammeln   (Sport)  (fig) to score points 
2  vr 
a  (=zusammenkommen) to gather, to collect 
[Menschenmenge] 
to gather 
(=sich anhäufen) 

[Wasser, Geld etc] 
to collect, to accumulate 
[Lichtstrahlen] 
to converge, to meet
b  (=sich konzentrieren) to collect  or  compose oneself  or  one's thoughts 
  gesammelt 
3  vi to collect ( für for)

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"Collins German Dictionary, complete & unabridged, 5th edition 2004, © William Collins Sons & Co. Ltd. , 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004"