doorstopper
A doorstop: a device for halting the motion of a door. / (humorous) A large book, which by implication could be used to stop a door. / A gauge used in geophysics.
(ecology) rehabilitation of an ecosystem, typically in order to save an important threatened species
(physics) The tendency for objects floating on a liquid surface to clump together.
(transitive, intransitive) To make or become dwarfed. / (transitive) To dwarf.
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