  We study the effects of strain in moir\'e systems composed of honeycomb
lattices. We elucidate the formation of almost perfect one-dimensional moir\'e
patterns in twisted bilayer systems. The formation of such patterns is a
consequence of an interplay between twist and strain which gives rise to a
collapse of the reciprocal space unit cell. As a criterion for such collapse we
find a simple relation between the two quantities and the material specific
Poisson ratio. The induced one dimensional behavior is characterized by two,
usually incommensurate, periodicities. Our results offer explanations for the
complex patterns of one-dimensional channels observed in low angle twisted
bilayer graphene systems and twisted bilayer dicalcogenides. Our findings can
be applied to any hexagonal twisted moir\'e pattern and can be easily extended
to other geometries.
