doubleU (pluraldouble Us)

1. Alternative form ofdouble-u
2. something in the shape of two U's (not of a W)
   • 1942, Playing Tricks with Plants,Popular Science, Vol. 140, No. 3 (March), p. 110:

     In training a tree in thedouble U […] only the two topmost buds are allowed to grow on the trunk and two arms.

• triple U (something in the shape of three nested U's)

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