marrow

marrow /ˈmeroʊ/ noun
plural marrows
marrow
/ˈmeroʊ/
noun
plural marrows
Britannica Dictionary definition of MARROW
1 
[noncount] : a soft substance that fills the bones of people and animals
— called also bone marrow
2 
[count, noncount] British : a large, long vegetable with dark green skin

to the marrow

: very much