Definition of underprop in English:

underprop

transitive verbtransitive verb underprops, transitive verb underpropping, transitive verb underpropped

[with object] archaic
  • Support, especially with a prop.

    • ‘A bearing is provided for underpropping the shaft extension of the free end of the printing roller.’
    post, rod, pillar, column, support, foundation, piling

Pronunciation

underprop

/ˌəndərˈpräp/ /ˌəndərˈprɑp/