Dutch

  • dubbelvouwen [dubbelgevouwen, dubbelgevouwd, vouwde dubbel, vouw dubbel, vouw het dubbel, etc.]

English

  • fold double
  • fold in two (IATE)
  • fold in half
  • double (up)
  • bend double
  • bend in two
  • middle (het zeil dubbelvouwen = middle the sail)
  • [TEX.] double, fold[1]

Meaning of ‘to fold’

fold: 
Bend (something flexible and relatively flat) over on itself so that one part of it covers another

Synonyms: double, double over, double up, crease, turn under, turn up, turn over, bend, overlap;
tuck, gather, pleat, crimp, bunch 
(Oxforddictionaries.com) 

References


  1. Comprehensive Dictionary of Industry and Technology, Graham P. Oxtoby