underkeep noun 4verb 2forms 3 noun4 •An underground reserve.The earth was swallowing Abascar. "The Underkeeps caved in." — 2007 •A keep or storage space located beneath the foundation of a structure; cellar.[...] located in the bottom of the driving-box cellars (underkeeps), a perforated plate being used between the axle and the cake of grease. — 1907 •Any storage space or reservoir placed below another object.They have sliding underkeeps of ample oil capacity with pad lubrication and the underkeeps are supplied with oil direct from a mechanical lubricator. — 1951 •An underkeeper, guardian, or custodian. verb2 •To keep under or in subjection; subdue; suppress.Like as a fire, the which in hollow caue / Hath long bene vnderkept, and downe supprest, / With murmurous disdaine doth inly raue […] — 1590 •To keep or maintain inadequately or below standard.Most houses on Oakland Ave. have large basements that are underkept. — 2011 formsunderkept · underkeeping · underkeeps