(double modal / stacked modal, used in some dialects, chiefly Southern US) should perhaps (used to soften should and make it less of a command)

(roofing) A type of seam between adjacent sheets of metal roofing material made by turning up the edges of two adjacent panels and then folding or interlocking them in a variety of ways.

A mattress whose elasticity is produced by a sheet of tightly-stretched wire.

Third-person singular simple present indicative form of ladder