  The rules for Yang-Baxter (YB) deformation for a generic Green-Schwarz string
sigma model has been obtained recently. We show that the deformation can be
described through the action of a coordinate dependent $O(d,d)$ matrix on the
target space fields both in the NS-NS and the RR sectors, generalizing previous
results. This enables us to show that the YB deformed fields can be regarded as
duality twisted fields in the context of Gauged Double Field Theory (GDFT). We
compute the fluxes associated with the twist and show that the conditions on
the R-matrix determining the YB deformation give rise to conditions for the
fluxes on the GDFT side. More precisely, we show that YB deformation is a
process which takes a solution of DFT with geometric flux associated with the
isometry group $G$ and deforms it to another solution of DFT with vanishing
R-flux and non-vanishing Q-flux given by the structure constants of the dual
Lie algebra determined by the R-matrix. We also show that the non-unimodularity
of the R-matrix forces the generalized dilaton field to pick up a linear
dependence on the winding type coordinates of DFT, implying that the
corresponding target space fields satisfy the field equations of DFT in the
generalized supergravity frame. This provides a new perspective on the relation
between the non-unimodularity of the R-matrix, the trace of the Q-flux and the
generalized supergravity equations.
