apple core; core of an apple
dead center (of a baseball bat); sweet spot
continued alertness; unrelaxed alertness; follow-through (e.g. in archery); lingering affection; attachment
mentally strong; strong-willed
apple core; core of an apple
padding; lining; foundation
Chinese water spinach (Ipomoea aquatica); ong choy; kang kong; water morning glory; water convolvulus; swamp cabbage
to get to the heart of the matter; to get to the core; to hit (a ball) with the sweet spot (of a golf club, baseball bat, etc.)
spare pencil lead; pen refill (cartridge); replacement wick (e.g. of a lantern)
axial center; central axis
candle wick trimmer; snuffer; douter
thick obi sash; sash padding
eccentricity (in mechanics, electronics, etc.)
pencil lead case (for a mechanical pencil)
collar core (stiff fabric, etc. inside a collar)
lead pointer (for a clutch pencil); lead sharpener