polje -plo- gismu

x₁ (force) folds/creases x₂ at locus/loci/forming crease(s)/bend(s) x₃.

For agentive folding (= plogau, plozu'e); use cardinal-value sumti in x₃, or rapli, to indicate multiple folds. See also korcu, cinje, boxfo, boxna.

jbovlaste

In notes:

boxfo: x₁ is a sheet/foil/blanket [2-dimensional shape/form flexible in 3 dimensions] of material x₂.
boxna: x₁ is a wave [periodic pattern] in medium x₂, wave-form x₃, wave-length x₄, frequency x₅.
cinje: x₁ is a wrinkle/crease/fold [shape/form] in x₂.
korcu: (adjective:) x₁ is bent/crooked/not straight or direct/[twisted]/folded.
tagygau: g₁ tucks t₁ onto/into t₂.
zilplo: x₁ is folded/creased at loci x₂.