spisa -spi- gismu

x₁ [object/substance] is a piece/portion/lump/chunk/particle of x₂ [substance].

In notes:

pagbu: x₁ is a part/component/piece/portion/segment of x₂ [where x₂ is a whole/mass]; x₂ is partly x₁.
panlo: x₁ is a slice [thin flat portion] of x₂ (mass).
jufspi: s₁ is a fragment of sentence s₂=j₁ about j₂ in language j₃.
mi'ispi: s₁ is a piece of machine m₁=s₂.
nabyspi: s₁ is a crumb of bread n₁ made from grains n₂.
spijbama: j₁=s₂ is a cluster bomb with submunition/clusters/bomblets j₂=s₁.
titspi: s₁=t₁ is a sweet/candy/confect.