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tunnel collapse: a passageway through or under something, usually underground (especially one for trains or cars); "the tunnel reduced congestion at that intersection"; force a way through

fold collapse: the act of folding; "he gave the napkins a double fold"; a pen for sheep; a folded part (as in skin or muscle); a geological process that causes a bend in a stratum of rock; an angular or rounded shape made by folding; "a fold in the napkin"; "a crease in his trousers"; "a plication on her blouse"; "a flexure of the colon"; "a bend of his elbow"; incorporate a food ingredient into a mixture by repeatedly turning it over without stirring or beating; "Fold the egg whites into the batter"; become folded or folded up; "The bed folds in a jiffy"; bend or lay so that one part covers the other; "fold up the newspaper"; "turn up your collar"; intertwine; "fold one's hands, arms, or legs"

trench collapse: a ditch dug as a fortification having a parapet of the excavated earth; any long ditch cut in the ground; a long steep-sided depression in the ocean floor; dig a trench or trenches; "The National Guardsmen were sent out to trench"; cut a trench in, as for drainage; "ditch the land to drain it"; "trench the fields"; set, plant, or bury in a trench; "trench the fallen soldiers"; "trench the vegetables"; cut or carve deeply into; "letters trenched into the stone"; fortify by surrounding with trenches; "He trenched his military camp"

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